It does not really complicate things for me. It actually makes things more simpler to understand. She has lost a lot of weight and have not really dated for a long time.
Your advice give me the understanding that choosing the wrong clothing for her can make her more anxious and she starts getting into more pain.
Now how about if she tries on the same dress of her choice several times and keep looking at her self, smiles, and asking me what I think. Do you think that is a dress she would want to wear even with RSD?
BTW, she is a lot older than 18.

I think her mom thinks it is cute of me trying to get her dressup a little instead of her old sweats.. lol.