The Predator could have killed Ana!
"Spoilers ahead"
According to the Predator's "code of honor". As soon as she picked up Poncho's machine gun and attempted to open fire against him. That would have automatically made her "fair game" and could have killed her, right then and there. Regardless if Arnold kicked it out of her hands. I know! I know! The Predator had his sights set on the main price and wasn't interested in leftovers π
PS: Why did she try to do so anyway!? After Arnold specifically told her that the Predator spared her life because she was unarmed. Maybe it was an act of desperation. As opposed to a calm and collected decision (los nervios). She probably figured "it's gonna kill us, anyway! So may as well go down fighting".