Hm - I have a 12yo as well; she's pretty confident in her writing but vacillates between "i'm bad at math!" despondency and "well, ok, actually I'm not bad at math, but it requires some concentration and I don't want to have to work at it."

Do you think they'd be interested in connecting? Mine is ~35 pages into a book she is writing (!); I don't think she knows about Wattpad so I'm looking forward to sharing it with her! If nothing else I'm sure she'd be up for giving yours a pep talk.