I don't know about the art without credit part but she could full well not know the artist in question's problematic shit, unless the person flat out shows in some way they support that specific content they may not be aware, you do not call out the people that like some of the creators content as there's nothing wrong finding a drawing cool/etc. Not everyone has the same feed + same information about the artist, they could've full well just saw some1 re-post those specific artworks/look up 'jojo art' and use them without knowing the background.