My mother is in enhanced memory care AL. She has dramatic behavior changes. Goes from delightful to wicked in a moment. Can anything help?

No apparent trigger. She will be asked to leave if she keeps up her nasty behaviors. She gets violent, throwing things, screaming, tried to hit an aide with her walker. We hired the aides to try and stabilize her afternoon and bedtime routine. She has a prescription for lexepro and seroquel. Sometimes she refuses them. She becomes oppositional and paranoid. Anyone experience this? Is there anything that could help her?
thank you