Hi my daughter is 4 and loves dancing and music and is quite an actress.
She has quite a severe speech disorder, so when she sings, no one would be able to tell what she was singing. (Only if they knew the tune). I don't know if Stagecoach would be good for her and improve her confidence. I know they have singing lessons which might be difficult. She enjoys singing, but they'd have to be understanding.
If Stagecoach isn't suitable then we could try ballet or tap, I'd like her to have a hobby that's fun and will improve her confidence.