Is she 11? I thought she's meant to be 14 in here. Didn't they state that specifically? At least if she was 11 and actually 11 in real life, that would leave some room for her to age up later. But as I mentioned, since she's already 14, she's going to be 18 and legally an adult by the 4th season.
Even before that, if she's eventually 16, that's already older than what Spider-Man is now in the MCU, and easily as old as Buffy was in her first season.
It would've been much better to make her about 10. She would've looked different to the others, and it would've been more of a spectacular sight seeing a little kid being so strong. But she's practically the same height as Gert. She doesn't look like a small child.
And didn't comic Molly have temper tantrums? I know some teenagers can have them too, but it doesn't look becoming on them.
Her physique looks wrong for Molly, who was more of a small child's physique in the comics.
If they did have to race swap her, then even Emma Tremblay who plays Ruby in Supergirl would've been better:
Although I don't know how much better. And even she might not be young enough, but at least she looks slightly younger. They really need someone who hasn't gone or isn't going through puberty yet.