Dang, that's really unfortunate but I think that unless you manage to clear your cycle (last 15 villagers who moved out) then you can't invite her back in bc she was one of the last 15 villagers to leave your town -- I moved Blaire and Pekoe out into boxes for a friend but she couldn't take either because the "move into my village!" prompt wasn't coming up and it was likely because they had been in the last 15 villagers to move out... ):
If you want to try I'd be down to get Chrissy back into boxes for you though, but just letting you know!