Find a person adopt her and ask if they have amiibo to kick her out right after she moved out ur island ( a.k.a u got her empty slot ). Come to that person island and adopt her back, she will rmb who you are. I did that to my 5 starter villagers for reset their house but still keep their memories about me.Might let Dotty leave and come back since she's using block furniture. But she's my closest friend, I don't like the idea of her not remembering me.