How about I say I want her to choose a stall farther away from mine. I don't think that is unfair, do you?
Really, you want someone to choose a different stall? Does this person do something in the stall that disgusts you?
Yes she keeps farting and it reeks like hell. I can't stand it anymore.
I think this is a reasonable request given what you told us. She's the one being inconsiderate.
I don't care if she is being inconsiderate or not, she needs to pick a different stall. That or I'm gonna sue the school.
You can be disgusted when someone farts too much near your stall, but sueing the school seems to be over the top. Take yourself to another stall away from hers if she doesn't move to one. Its that simple.