My spouse's mom and yours must be on the same wavelength...what's up with telling your kid they are/will be ugly and no one will want them?!?!?!
(Just have to insert here that is a complete and spurious lie, don't you believe this about yourself for a second. Whoever gets to love you in your life will be a lucky person indeed, because of who you are, period, and if they are worth you, they would find such an idea about you offensive, and someday be so glad that you didn't listen to that nonsense.)
Enough to make li'l ol' me want to challenge someone to a bout of fisticuffs.
Then my amazing spouse shows the most humbling love and patience for their mom, and I feel all chagrined, because as hard as it is for me, it has to be harder for my spouse. How do they manage to be such a saint?
I then remember that as stupid as it is (o.k., still working on the anger), they are trying to "save you" from something they really just don't understand and are terrified of, and it all really stems from the love they have for you, as messed up and misguided as it is. This is hard for them, too, and we all will do better the more love and patience and forgiveness prevails, which creates fertile ground for opening hearts up for understanding.
I've found Eva's right on the mark,
"The best way to deal with that is to stay calm, be understanding, and show her that this is the correct path for you and that you are living a successful life in spite of her warnings of doom and gloom."
(I think I need to keep that quote handy to help me stay centered and calm when thinking about all of this in regards to my mother-in-law....put down the fists...don't turn all gremlin...)
I should know better...that's basically the drill I went through as a teen with my parents when they didn't like my choices on religious beliefs. It took time for them. Show love and patience and eventually they come around. They had to see that this was the path I was choosing, no chance of changing that, and that it didn't turn out all bad like they feared. This subject is so much more emotional for me than that was, though, because I know how much their support and/or lack of it means to my spouse. I will re-read Eva Marie's quote, and try to get my zen on. =D
Hugs to you. I know this is so hard on you. Maybe the next time your mom says something crazy hurtful like that, say, "Mom!" give her a hug, look her in the eyes, and tell her you know this is hard on her, and hard for her to understand, but you want her to know you love her no matter what. That will come a little out of left field, and that will be good.
You can leave it at that, or if she asks you what all that is about, you can say you know she is afraid for you, and that is where those comments about you being ugly and never finding a partner, etc. are coming from. Apologize again that this is so hard and scary for her. You can say this is scary for you too, and you can't guarantee anything about the future, but you do know this is what you need to do, and you understand if that is too hard for her to accept or understand right now. You just want her to know you love her & always will.
Your calmness and maturity & positive response, especially if kept up long term, will eventually find a crack in her defenses and get her to think a bit, question her reaction.
At least that's the theory.
Good luck, and anytime you need to vent before you can get your zen on, know we are here for you. (hug)