@Pumpkin108 WOW! It's not often I am shocked, but that is a fucking DISGUSTING way to talk about you. This woman sound like a c*nt, and your DH sounds worse.
I agree that she sounds spiteful, jealous, and bitter.
@BessMarvin
Her motivation seems like she would want to appear attractive to your husband compared to you. She may not be after him but just be one of those women who needs to feel like everyone finds her the most attractive.
This ^ is spades.
I honestly don't know if I could move on from this. I cried for half a day when I was 8 months pregnant, and DH pointed at a mirror we were passing in the shopping centre and said 'wow look at the size of you! You look like a hippo!'
He didn't mean to upset me and he said sorry about 5 billion times, and never said another thing like that before or since... But as I said, I really would struggle to move past him mocking me behind my back, with some woman at his works, and saying my body will be fucked up and I will need nappies after having a baby. (ALSO, you do know that is utter bollocks right?!)
Also, how and WHY does she know about your condition? Has he been chatting to her about your health issues too?! Fucking hell, he sounds like a real prize! 
@Sicario
Fucking hell. I would go proper mental over this. I might even phone her and give her a slice of my mind. "How fucking dare you talk about me like that to my husband. Who the fuck do you think you are? If I ever see you or hear another report of you disrespecting me, there will be serious consequences." Then SLAM the phone down, preferably across husband's head.
This 100%. And LOL at the last sentence! 