Do you take out the trash when it gets full or when it starts overflowing?
Time to get a new room, or roomate. I take mine out when it is going to be collected or when the trash can indoors is full.
i take it out when its full, nnaybe you need a different roonnnnate
In any home sharing situation, there will always one person who is the least tidy. And the other people either (1) "pick up the slack" and tidy up after this person, or (2) refuse to tidy up after this person, resulting in the everything deteriorating to the level determined by this least tidy person -- that is, everyone lives like a pig rather than clean up messes that aren't their own. So it's up to you whether to continue "taking up the slack" or instead live with the filth.
when it is full so it doesn't stink up the house
Either get separate trash cans, and keep yours in your room. So you never have to take out HERS. OR -- just stop talking out the trash no matter how overflowing it gets. When she realizes that you are stopping taking out the trash, she at some point will do it. But you can not give in and take it out,=. If you do, then your problem will never go away.
You Don't, take it out yourself or let it overflow, your choice.