For me, a half hour lesson for every 5 hours of skating is right for me. I practice really hard between lessons, working on what my coach wanted me to try to improve. I have to have my own "homework" time, where I figure it out. And, I really am proud when my coach sees an improvement in an aspect. But, I am a mid-40's person who has discipline.
Some kids are on the ice for many hours a week, but just tool/fool around. They are not stretching their limits. For them, it may seem like they need a drill sergeant to watch over their skating every second. Honestly, I think that they don't like skating all that much, and are doing it for their parents. The kids that really like the sport, have a spark on the ice and see each new move as a challenge.
If the kid is more mature and spends about 80% of their time actually working on what the coach told them to do, they are learning. I strongly recommend a child of this age have a notebook where the coach writes down what is needed to be done. Also, when I was a kid, I "paired up" with other skaters to work together. We'd take turns doing a spin, and critqued each other, supported each other, counted revolutions, all sorts of stuff. We'd take turns jumping, have contests, and it was a fun hour. We actually ended up doing alot of spins & jumps in an hour (more then if we were fooling around alone), and we made friends and had alot of fun. As long as the coaches saw us moving and working, they left us alone. But, if we were chit-chatting, then we got a stern warning. Remember, skating is a very lonely sport. You have to balance "fun time" with work. If it's all work and all alone, she'll get burned out.
That being said, once she is doing doubles/triples, then the lessons need to be more frequent for her safety. Any "bad habit" can not be tolerated, as her risk of injury increases.
Is she doing any ballet and/or yoga? I strongly think ballet is needed for all skaters of all ages and abilities. Put her in a real dance school for an hour a week ballet class. Check out the dance school, as some promote healthy body & mind images. While others don't, and are run like a cult (google "Dance Cult" or "Ballet Cult.") My daughter's dance school has a cafe where they sell all sorts of foods, including some junk foods. And, the heavier girls are in the front row, if they are the better dancer. Some things to look out for.