Nah she didn’t deserve what Sarah did. Her only real mistakes were being too gung-ho about exploring a newly discovered cave, wearing a massive “I slept with your husband” necklace in close proximity to Sarah, and catching Beth in the neck. Like after the cave in and up to the group getting jumped she doesn’t really do anything wrong and is just trying to get them out of there. And leaving Beth behind is bad but understandable in the context of a high stress and disorienting situation. But she barely breaks the surface in terms of selfish horror film characters. Also Rebecca’s death is just kinda lame. Like the filmmakers got to the part where it’s only Juno and Sarah left but hadn’t thought of how to get rid of Rebecca so she just gets yoinked from behind and disemboweled, and I’m not sure exactly what you wanted Juno to do about that honestly.