Does she draw well? If so, consider entering the Scholastic contest.
https://www.artandwriting.org/ If she's up to it, she might put together enough stuff to attend National Portfolio Day.
https://nationalportfolioday.org/ (I know she isn't interested in arts schools, but it might give her some good feedback about which if any of her drawings, etc. are good. )
Also take a look at the arts supplement pages of some college admissions offices. I think the Common App has a place to do one.Do not submit one unless her stuff really is good--which is why attending something like National Portfolio Day can help you figure out if is good.
Also enter some local art contests.
She's got some time, so if it's a sincere interest, have her take an art course at a local arts school. She's got time to do it next summer. If she's good, that can help her put together a portfolio or arts supplement and/or get a LOR from someone who can vouch that her stuff is good.