I had two friends with bulimia. One stopped after her daughter was born. By that time she needed $40,000 with of dental work, because the stomach acid had ruined her teeth. The other was a mental mess, the bulimia symptomatic of so many wrong things in her life.
When my daughter started vomiting when she was 13, we got her into to see a child psychiatrist in a few weeks. We had just moved into our new home and the bathroom doors had not been hung, it was so easy to hear her, that is how we found out! I don't know what that doctor said, but after 6 sessions she was better and never happened again. She was very involved in figure skating, wanted to be a pro, and might have thought she needed to be a bit thinner. She became a coach instead.
So it is possible to quit forever, but sooner is better than later, a before the damage has occurred. I'm sure glad the counselling is working! Keep up the great work!