Need guest list advise

Etiquette allows excluding persons who are violent, racist, and toxic. Whatever your daughter's relationship with her Aunt is her business and her choice. No one is entitled to an invite. If the Aunt's family feels strongly about the exclusion, they can decline.

She and the groom are entitled to invite whoever they want, at the end of the day. The aunt feelings are not the couple responsibility to deal with.
P
Some people on WW tend to forget that it's the couple's wed, not parent's, grand-parent's or aunt's in the first placz.