I'm kinda emotional right now so bear with me...
I just got an email from my mom that basically told me about how much she doesn't like my fiancee's family, and that she thinks they and he are snobbish. The whole email was very emotional and she says that this has been "building" and that she feels like we don't have a relationship anymore and that my FI and me's relationship has taken over and that she wishes she could have left me and my brother with our father 20 yrs ago and got a job in another state. I am super hurt by this. I can't even begin to explain how hurt I am. I wrote her back saying I don't know where this came from, but that I call/talk to her almost every day (we have always had a really close relationship) and that she has always been the one person I have been closest to. My mom and I have always been really close, (dad's outta the picture) and we have a really small family (I have one sibling, no extended family except one cousin and an aunt). My mom has been depressed this summer because she has been having some hard times and I have been trying to be there for her as much as I can. I have tried to see things from her point of view, and the only thing I can come up with is that she is depressed that her kids are growing up and she doesn't have us anymore at home. I just feel so crappy and sad right now because she is the only person I have had to really talk to about the wedding and plans, and about anything really. I don't have any girlfriends or anyone to talk to, and I have always shared things with my mom.
I don't know where this came from. I don't knwo what to do. She also wrote that she thinks it's crapy that I am going with my fiancee to family camp with his mom (it happens to fall over his mom's birthday, and I couldn't spend my mom's birthday with her this year because her and myself had to work). I don't know what to do to make her realize that I will always love her no matter what, and that just because I am getting married she is not losing me. I am panicking right now because if she is going to be against this whole thing then I will literally have no one to be with and ask advice from about anything wedding related- let alone anything else. I'm sorry about this rant but I am at a loss right now and I feel super hurt and don't know what to do.
She lives about 1 hr & forty minutes from me, we both have summers off and I have visited her multiple times this summer, and she hasn't visited me once even though I have tried inviting her. I don't know what she expects me to do- I try my hardest to keep her a part of my life and to let her know I'm here but I feel like this just shows she doesn't think it is enough. I was thinking about giving her some space and not calling her for a couple of days, but I don't know if that will just make it worse. I just don't know what to say to her. She is the type who will act like nothing happened if I don't talk to her for a day or two and she calms down, but I feel like this is going to stay under the surface unless we both talk it out but I don't even know where to start, and I'm afraid if I bring it up it's just going to end with me crying and her hanging up on me.
Edit: To reference the "snobbish" thing above- my FI's parents both have well-paying jobs, own their own houses and my mom has a part-time job, rents and she has always felt like she didn't make enough to provide for us (her words, not mine). That is where I think she gets that word from. It shouldn't matter, but it seems to matter to her.

Neither sides of our family (my mom, his mom or dad) have ever wanted to get together with each other (even if we wanted to set something up) so they haven't gotten to know each other at all.
