First of all, she's so cute and pretty in her dress! Did you take care of all the kids for the recital? They look so nice!
Second, she's singing solfeggio and playing the piano in the same time, and she's into it too! It's definitely something she's practicing at with pleasure and interest.
You asked in a message about tips or ideas to help her use her whole hand while playing. Well, as you've seen Alin, I will tell your from our experience. While watching him "fooling around" with the EK and mainly after recording him yesterday I understood that
he's learning best by imitation. Not sure Cayla would do the same. I did try to teach him to use his hand, but he didn't want to. Instead, he watched me doing it and it was like his brain told his fingers to move. And, one day, what do you know? He started to use more fingers!
So I guess it depends on the child. Some kids just get it faster, even play with both hands much faster. And here, in the recent recitals posted or in past messages, we can see examples. Some just need more time. Or different approaches. It's up for us to try.
Hellene was telling someone to try this (can't recall Hellene's post): say to or help your child to play along with "Mrs. Hellene" (with her teaching video). I don't recall when we should try this. Maybe it will work for Cayla too, now or later.