This dream, first of all, your grandmother should be more concerned about you when she was alive. You should be a person with no opinions and weak principles.
Grandma cooks eggs for herself, which shows that you want someone to care about yourself, give yourself an opinion, support yourself, and then get your bike back. It should be that you have your own things in real life but don't know how to ask others for them, so the appearance of grandma in your dream gives you strength and allows you to get your own things back.