What should I do? My aunt suddenly ignored me these days. She talked and laughed with me before and called me.

You have ulterior motives! She was close to you at first because she regarded you as her family. When she found your motivation, she kept her distance from you rationally and in time! This is undoubtedly a smart woman. You should also straighten your mind. If it's not yours, forget it! After a long time, she will ease the relationship with you!