Will this look bad to my mom?

So I'm 23 and moving out in about 27 days. About 2 weeks ago I brought up the idea that I should move out to my mom but I didn't tell her I already had plans. I didn't want to make it seem like I was going behind her back. She said it was my decision and I should do what I want, but she also said I should take care of my car repairs and get things situated. I have been planning to move since Apr-May. I am going to tell her tonight, but I don't want it to look like I rushed into anything or I am trying to move ASAP. Will the fact that I am telling her about my move less than a month before look bad?