Really, this issue is nuts!!!!!

I can only see if my daughter was on the team for the Olympics in the next year allowing her to train twice a day!
There is just no need for those hours at any compulsory level, and I really don't even get it at the optional level. I have heard of down south gyms that have level 4,5,6 girls training huge numbers of hours, that is nuts too, but to split the training.
My reply to the coach would be, we'll cross that bridge when we come to it, but I'd also be looking for another gym that could train my child more effectively in a sensible amount of time. Decent group sizes, no standing around and a strong coaching style would be my first requirements, if my dd could not aquire compulsory skills and routines with those conditions in 12 hours a week, I would have to realise that gym is not her strong point!!!
As for going to the gym while mom is working there, well that's just fine and frankly it is good for the girls to see how hard mom works to provide the "extras" in life, and lets remember folks gymnastics is an optional extra!