Not much is known about Isabelle's early life except at one point she joined the IDF as a sharpshooter. At some point she heard a story about a Special forces team that was wiped out by a strange creature back in 1987. She learn tactics on how to fight the hunters that were reported by the squad's sole survivor.
Some time later, she and her spotter were ambushed by the enemy. She could only watch while he died but refused to help, as she herself would have been killed. She was later abducted by the hunters.
On the Hunting ReserveEdit
She later awoke in a free-fall in the sky with a parachute attached to her. She later watched several men fight each other, believing to be responsible for being stranded in the jungle. Royce was the first one to spot Isabelle with her rifle trained on the three men. Nikolai then asks what jungle they're in and Isabelle then claims that she hasn't seen the jungle and that she has seen most. Isabelle then says they could be in the Amazon.
After meeting up with several more people, Isabelle and the others sought out answers and away out of the jungle only to find that they were no longer on Earth. When the group later came across a body of a Special Forces member that had been stationed in Afghanistan, Isabelle brought up that they should bury him.
Dealing with NolandEdit
Soon Isabelle and the others were attacked by hunting hounds. She ran out of ammo for her sniper rifle, and attempted to commit suicide with her customized HK45 handgun as her primary sidearm of choice, as a hunting hound was charging toward her. However, the Tracker called them back, because it was merely a test to see how well they could kill. After the hounds were called back to their masters, they noticed that Cuchillo was missing. They came across him wounded and calling out for help. She was willing to help him, but Royce advised against it, sensing a trap. She shot Cuchillo to put him out of his misery, only to hear him again call out "help me", showing her that it was indeed a trap.
Following the tracks of the hunting hounds, the group later came across the hunter's camp and found a bound hunter that matched the stories Isabelle heard about earlier in her career. She soon realized that Royce used them as bait in an attempt to kill their stalkers, so after a brief firefight with the predators, Isabelle and most of the others escaped by jumping over a cliff into a river. Afterwards, Isabelle and Royce got in a confrontation over his attitude on survival and her knowledge of the captive hunter in the camp.
Hunted by a different hunterEdit
Isabelle later refuses to leave Edwin behind when he is wounded by a trap, due to her remorse she felt for her spotter and refusal to ever do that again, almost getting herself killed by both Mr. Black and Edwin. Instead of escaping on the Predator's ship, Royce comes back saves her from both Edwin (who poisons her with a paralytic neurotoxin he found earlier) and Mr. Black which inadvertently saves his life—had he tried to escape on the ship, he would have died when Mr. Black remotely destroys the ship. Edwin tries to kill him, but Royce mortally wounds the doctor, then booby traps his still-living body and leaves it in the Predator camp.
Royce waited until Mr. Black triggered the trap, then attacked. It gains the upper hand and almost kills Royce, but Isabelle overcomes the paralysis enough to shoot it, saving his life and giving him an opportunity to kill it. However, the Berserker fires his wristblade at her, hitting her shoulder. He then stumbles over to her and they talk, finally exchanging names. The next morning both their wounds have been treated somewhat and they watch as more humans and aliens are air-dropped onto the planet. Royce vows that they will find a way to escape.
Stranded with RoyceEdit
After spending several weeks on the reserve she developed a romantic relationship with Royce before he goes off into the wilderness for several weeks by himself, much to Isabelle's annoyance.
Personality & TraitsEdit
Unlike the others, except Nikolai, she shows concern for the entire team and is infuriated when Royce uses the group as bait in the Predators' camp. His bitterness and ruthlessness saddens her, leading her to bluntly ask him, "What made you so f***ed up?" Isabelle carries a deep guilt over her spotter's death, where as attempting to rescue him would have gotten her killed as well. She carried the guilt for several months after the incident
She carries a Blaser L93 sniper rifle and a blue-tone customized HK45 pistol, and is the only one of the team who has their weapons and ammunition left at the end of the hunt. She still used the weapon even after being stranded on the game preserve for several months.
- When telling the others about the events of Predator, Isabelle states Dutch's team encountered the Predator in Guatemala, when in fact they were in Val Verde (although the they were briefed in Guatemala at the beginning of the movie).