Since My Fiancé Was Stolen by the Saintess, I'll Lock Myself Away in the Museum of Magical History

https://www.cmoa.jp/title/321497/
A lonely noble lady, Mary Ann, has her fiancé stolen by the saintess. She flees to the city of Oriesta, home to a museum of magical history. By night, the exhibits come to life. The Fairy Queen tells her she has a talent and must become the manager of the Fairy Exhibit. To succeed, she must befriend fairies who have been gone for 200 years.