At most professional schools and companies around the United States, there is usually a fall performance, a winter performance (usually holiday based), and a spring academy showcase. I think 3 times a year is a decent amount, although if what she really loves is performing, maybe finding another studio would be beneficial. Preparing for performances can take 3-4 months sometimes, so 3 performances is a good amount in my opinion. If she loves her friends at her studio and is okay with that amount of performances, I wouldn’t recommend moving studios, especially if she doesn’t plan on dancing as a career.