Yes it made sense but you know what didn't? The fact that she didn't communicate in writing! That's just something I'll never forgive. Everytime shit could've gone better if Quiet could communicate something I kept thinking "why won't she grab a pen and paper and write it???"
What would she write? Remember that she says at the end she couldn't decide for awhile whether she wanted to kill BB or not. So anything that potentially threatens her ability to do that (hey I'm infected with a parasite, kill me or exile me) is out.