Mom can't get a break these days

I go to the gym 5 times a week. It's for me and my sanity. I love the way I feel afterwards, the increased energy, the endorphins and that 90 minutes of "me" time. I go to the local Y where they have a wonderful child watch room. The women are friendly and trustworthy. Recently my eldest daughter has been anti gym. I have no idea what or why this happening. Is it the terrible two's, seperation anxiety, initmidation from adults? It breaks my heart to find that she is not engaging with the other children her age. She loved going there before and now this. She is going through something right now cause she's doing it around family members too. So do I not go to the gym now? Others say it's a phase and they will change, others say you deserve this one hour. It's good for you. I don't know what to do.