Ask to have the DOCTOR adjust them. Tell them outright that you've been there several times and the optician made them worse. So ask to have the doctor adjust them. He should be able to get them just right.
Put some powder or corn starch on the sore areas. That will help heal it. Do NOT put any lotion on those places that hurt because that will make it worse. It has to be something like corn starch or powder. Believe me, I did this for over 15 years. I don't know why those idiots couldn't get her glasses adjusted corrected!

My patients were always satisfied -- and I never let them out of the office until the glasses were straight, and sitting on the face like they were supposed to be!
Bless your sister's heart -- it's bad enough to have to wear glasses in the first place, let alone having them hurt and not fitting well.

This makes me mad! The opticians obviously were not trained at ALL. Grrrr. God bless you both and take care. Hugs, Lee