Can't comment on the comments thing but there could be some genuine things.
I'm 9, nearly 10 weeks pregnant, and smells are killer. Shower gels, air fresheners, cat food, the air. Everything is absolutely honking and it's exhausting.
I live with my DH and although I want him in the house I also want to be left alone a lot too. Like at nights I'll go through to bed at 7/8pm and stretch out to be comfy and watch a show I want to. Dh wanted to come as well to keep me company, but honestly I just want the space to myself for awhile. At weekends I'll do the same for a few hours in the afternoon. When he does come to bed, I feel like I'm constantly having a go at him as he fidgets and sways the bed (which is not great when you feel sick af).
I also cant stand being cuddled atm, as in bed I'm too warm and when I'm up and about I can smell his deodorant or even what he's been eating. We now have a thing where he just pats me on the head.
When we visited the midwife for my booking appointment she said it was totally normal to feel grumpy. hormonal and just nothing like yourself in 1st trimester. She then turned to Dh and said don't worry, your wife will be back soon and laughed.
It makes me feel like a total hormonal bitch but he laughs about it as he knows I'm not doing it on purpose. Your DP is growing a human, it can make you haywire.
Were you okay before she was pregnant? Like others have said, I'd spend weekend at hers, even if you need to sleep on sofa or floor. Just so you're there and helping as much as you can as maybe she's worried about when the baby gets there. Maybe have a chat too? It's hard but it might be worth it to feel better. Im hoping it's just hormones for you