Under armor is a brand of compression shirts that are used for athletes. They are nice and squishy, and give just a little bit of deep pressure input. Have you tried specifically long sleeves that are tight to her skin? It might be worth trying that at a store to see if that feels better. Long sleeves and long pants, specifically tight to skin, and then other things over that for warmth might be an option and might not be, but is a thing worth looking into. I know I personally can't deal with stiff clothing, so you need to take that into account, but compression garments definitely help with what I can wear. I need to buy some winter-based compression clothing.

Under armor isn't the only brand, its just the one that is most reliable of the brands I know about.

I definitely would look into the deep pressure protocol for her. I've been doing the protocol (am the person who's been posting notes about it as I've been doing it), and its definitely been helping.

I definitely prefer compression clothing, and have certain types of clothing I prefer over others. What I can wear varies time to time. It's a hassle.