Lyric discussion by Ex Abrupto 

Cover art for She's Too Much For My Mirror lyrics by Captain Beefheart and the Magic Band

It's about an artist realizing his friend ( perhaps girlfriend ) has become materialistic. It could also be about someone, after discovering art and loving it, finding his friend to be totally lacking any artistic culture. In anyways, the girl is wasting her time. If you look at the lyrics " She make things fly and she make things roll ", it means that the " things " lack so much importance that they don't even have names so they're just " things ". The mirror is metaphorical for the love of oneself's physical attributes, the materialistic.