Hi OP
Just wanted to send my best to your daughter.
I too had bad acne on face and back at her age, and right into my 20s. It was some time ago now, but I tried the benzoyl peroxides which burnt and dried out my skin, the antibiotics , and the topical lotions. I was on Dianette too.
As with everything, I would initially jump for joy at success, but this would be short lived as my skin got used to it.
One thing I found very soothing ( particularly on back) was the topical lotion dalacin- not sure if still available?? Was like a roller ball deodorant, and didn't sting like the others. I had the most success with that.
I have to say, I tried everything! No choc (don't eat much anyway!) etc. I find I take my make up off at night and put a hot face cloth on to cleanse - similar to your daughters LE routine.
My mother pushed for appointment with dermatologist for me back in the day, waited months! I thought it was a miracle solution, but sadly he said there were much worse than my skin - which I appreciate. But it was so hard for my confidence at that age!
I am now late 20s. I can honestly say age helped. I got to 21 and they reduced dramatically.
Today I still get congestion on my back from time to time, I use boots tea tree back spray and a body brush - really works. Depending on how aggressive your DD back is this may be abrasive.
I started taking lymecycline (spelling!) again in January after a bad break out. For the first time the doc said stress isn't a factor - me? Not so sure!
I guess if there was a miracle solution we would rid it for good. I've heard so much conflicting advice over the years, am not quite sure what to say that will help your dd - other than I know how it feels.
I once had make up done by a lovely sensitive lady at Clinique which really helped my confidence - maybe a wee boost like that would help? I've been fortunate to have nice eyes (stealth boost) and the kind lady focused the make up on these, made me feel better at the time!
All the very best to DD