MarR99
Since your DD's gym will not compete current L6 gymnasts as new L7's this January, you have a year with no meet entry fees, coach assessments, new competition leo/warmups, related travel costs, etc for an entire year. Only tuition. That should ease part of your concerns and hopefully allow more time to come to a decision while under less pressure.
Remember that your DD may not really be able to completely and fully communicate with you all of the benefits she experiences through and because of gymnastics.
Trust her coaches when they let you know that she is progressing!
I do understand the pressure is not financial alone, but also a matter of time and energy.