Mona is constantly switching sides, so much so that she could have way more enemies than she does friends at this point.
"A" has turned on Mona before. If she knows too much and "A" decides to focus on her again, it could mean lights out.
Why She Might Be Safe:
She's Mona. She's crafty, smart, and infinitely devious. Not to mention the fact that she seems to be on the "A" side right now.
After turning so many people on Ali, Mona has a lot of allies. It's hard to imagine how she might die over plenty of other characters, who are more defenseless and way less popular.