Keep her away from people, kids, dogs, cats, and welp, the rest of the world.
Give her all the paint in the world and put her in Alcatraz
The artist is not "sick". She is evil. We have seen her attitude in the past. She's not that different from the Third Reich or the Khmer Rouge. She just hasn't the guts to actually try it. Propaganda tends to beget action, though. She's not (yet) willing to attempt genocide, but she has no trouble with fomenting it.
Be aware.
Be prepared.