L.S.
You need to calm down, she is only 4, she isn't supposed to have great commitment to things at 4. Besides this is the time when you can change around the different activities she is doing to see what things she likes. If you think she does want to do gymnastics find a different program for the summer and see if one of her good friends wants to sign up for the class too. One of my neighbors pushed their daughter to do ice skating all the time and by the time she was 10 she hated it and wanted nothing to do with it. You could take a break this summer from the gymnastics and she will miss it if she really loves it. Really, I think you should offer her some different activities and let her try lots of different things. Try to find a good friend of hers to attend the classes with her...that makes things so much easier. Good luck, remember she is only 4.