I personally don't separate art from artist. There is too much art to choose from, so I don't see why I should support the art of an artist I don't want to support. There will always be more stories to read, I can drop one from someone I dislike.
As for your specific case... I dunno? Not enough information here. Dunno if the girl consented willingly or was pressured into sending her pictures, don't have proof of the allegations or anything like it. Dunno how you feel about a minor sending her own nude pics even if she was personally fine with it.
Make your own decision and move from there, I guess?