ART
1. the quality, production, expression or realm, according to aesthetic principles of what is beautiful, appealing or of more than ordinary significance.
5.any field using the skills or techniques of art: advertising art;industrial art.
just quoting the two as they are the most important for this example, SKILLS are learned and art is entirely subjective, if I tell everyone that my shoe is art and I get some backing from higher ups in the field it will become art.
In terms of becoming an art teacher, I am pretty sure you must become a generic teacher, and have some sort of minor/ major in art? Which means that yes, she probably has to be some form of an artist. Also the amount of debt is crazy.
I would also like her to know what the fuck she is doing if she takes this route, I have disliked every art teacher I have ever had, either because I already know what they are teaching, occasionally more in-depth and because they play favorites/ completely mark by their own interests.
Tell her to know software (if need be), how to paint/ draw, and how to be as un-biased as possible while still being able to critique and give actual advice/ classroom critiques are where it is at for that sort of thing.
Oh and she actually has to like art, not just looking at it, but if she doesn't constantly take photos or draw or do anything then tell her not to do it.