She is fearful of becoming someone else!
This might be an expression of identity disturbances which is associated with BPD.
She also says having to takes meds gives concrete proof there is something wrong with her brain.
This is part of the rub. This is why people with BPD (pwBPD) have great difficulty recovering from BPD. Without the emotional tools to accept that something might be wrong with you, you are inclined to prefer the denial that nothing is wrong with you.
She just wants an ah ha moment in therapy and then lead a normal life.
I don't think it works this way.
Being on medication says something about her and she doesn't like what it says.
If you had a medical problem and required taking medication to address the problem, would you stop taking the medicine because it says something about you you don't like?
She wants ppl to stop treating her how they do.
Do people treat her differently from how they would treat anyone that behaves like her?
She wants to be happy instead of always feeling like she just doesn't quite belong.
This sounds like a great discussion in therapy.
She just doesn't know how to get there and is having struggles trusting these drs to get her there.
I'm sorry but I don't know how to help on this regard. This is at the heart of the motivation needed for recovery - to want to get better.