I didn't read through all the responses yet, but wanted to say that I'd rather live in your cozy, loving mobile home with you, than in a mansion with that horrible snobby woman. I feel very sorry for her child, living with a mother like that.
I am sorry, though, that your child's feelings were hurt. Please keep trying, not everyone is like that.
I have a small apartment, not fancy, and ALL the other moms I know in this town have large homes, landscaped yards, the whole deal, but I have been so blessed to find a group that isn't judgemental about my considerably much lower financial situation. They're out there, good people. You'll find the right ones, and your little one will feel a part of things, don't worry!