The shorter version would be I'm trying meds let's give that a chance first.

I think your reasons are just gonna reinforce to her that you do need it. I would keep it very short and to the point.

I'm guessing she feels she IS compromising with IOP and meds. I'm guessing her getting your thoughts on IOP doesn't include a list of reasons why you feel you can't do it. I think the best way to convince her you don't need IOP is to convince her your safe...which as hard as it's gonna be, probably means NO self harm.

And tell her you'll do anything to avoid hospitalization of any kind including IOP...IF you really mean it. Then follow through.