@cherrelle I don't think 10 lb progress & 50 lb progress are at all insignificant gains over 90 days, personally, especially for your size. Second, are you sure that it's body fat causing the clothes fit changes? It might be worth it to do a BF assessment, especially if your weight is maintaining.
Have you had bloodwork done & a physical exam lately? The mood & body composition woes could be indicators of some other issue, like maybe thyroid or glycemic control issues.
Also, how do your macros look? Have you tried messing with them to see if that helps your energy?
I know people will say to disregard the trainer, and I agree that finding a trainer who will support your goals is very important. I will say that I've been using one for the last year, and I was crazy weak in my core/upper body areas like most ladies, and she started me with core/bodyweight stuff for the arms/shoulders/back. I have seen slow but steady progress there, though, and I can now do 75 lb lat rows, and 65 lb. overhead presses, up from 15 lbs when I first got started. But again, that's been
very slow gain over about 13 months, especially compared to my legs.