I think what you want is possible. Maybe write a letter about just what you talked about here....

My daughter moved 3 states away 2 years ago and she is also Bipolar I. Of course I didnt want her to move away, but she wanted too and felt it was what she wanted/needed to do, Her destination had more to offer than the tiny town I live in... She has had a few bumps in the Bipolar road, but she coped and did what she needed to do to remain healthy. Her and I text daily and talk often .. In fact today I sent here a picture of a cute new pair of shoes I bought the other day .. She texted me back a picture of her foot that had the same pair on and bought them 3 days ago ! LOL we got a kick out of how similar we are in stuff.

Maybe reassure your Mom that you know how this will difficult for her and you don't want to hurt her but.... growing up and out is the natural way of things .

She probably won't be agreeable to everything, but baby steps maybe all you can get from her right now..

I hope you can start making progress in forging your own life.