friend’s mom hates me!

I, f21, am best friends with my friend Lacey f20, and Lacey’s mom really does not like me. Lacey and I became friends in high school, we were both good students and ended up coming to the same college. I am naturally anxious and have never been one to have a group of friends, but Lacey and I really hit it off and have been attached at the hip ever since. We are now juniors in college, former roommates but still best friends. All of that being said, I have always gotten along with Lacey’s family, but again I am naturally nervous so being at her families house really stresses me out. Apparently this really offends her mom, and I’ve recently found out that she is telling Lacey that she needs to branch out and make more friends and she feels like I am holding her back. (Lacey has other friends, as do I) I don’t really know where this is coming from or what to do about it. Part of me feels like it’s because Lacey’s mom looks down on me for how I look, the fact that I come from a lower middle class family, and because I’m just not what she pictures her daughter being friends with. I don’t care about name brands or preppy things, not that liking any of that is a bad thing, and I feel like I can’t even be around Lacey anymore because of the pressure her mom is putting on our friendship. My family loves Lacey and Lacey loves them, I am just having a lot of trouble coming to terms with the fact that Lacey’s mom is against our friendship. She’s never said anything to me directly but I can tell by the way she looks at me and things I have overheard her say she is not a fan of me. Any advice for dealing with this?