Matt, by acceptance I mean the realization that you can do nothing except to let them go with as much love as you can manage.
Accept you can't change them; accept that they are damaged; accept it isn't your fault.
I think your version of acceptance denotes a degree of agreement with her ideas/behaviour etc. I do not mean that. I mean, realise that is who she is for now, and give her reality some space.
It is a bit zen - you get it when you get it. I didn't for a long time.
I agree with Ms Wonka - she has a wonderful succinct way with words - I have a girl crush!