It'll get better the more her vocabulary grows, she's just at that age. She's picking up English quickly since she has parents that have a very difficult time shutting up. Demigods are a little different, she might not have magic naturally, I didn't tamper with her genes when I was carrying her so I can't be certain what she'll be blessed with beyond beauty. That said, given how involved Johnny will be, she'll have some form of magic at some point.