Sorry this is a long messy story, but it doesn;'t seem anyone understand how i feel ( apart from my mom and my best friend )

i've been with my husband for 4 1/2 years now and everything is always fine unless my in-law is involved.
It's started since we've been together, she came from Europe to visit his son ( my husband ) and she's not happy with the way he lived because he didn't have everything like when he's at home with her and she complaint to me ( of course when he's not around ) about how i hang his clothes and where i iron the clothes, where we slept etc. ( we worked on the island ). i don't think she liked me ,one day i was sitting with my colleague in front of the office and she came out with the scissors and cut my hair ( i didn't see she came from behind ) i told her that i was not happy about it, i walked away and 10 minutes later she came and told me to move my butt back to work. I put up with this because i thought that she's not with us all the time. That was going on for almost 2 years and she came to visit 3-4 times a year and stay 1 month at each time. i remember after Tsunami she wanted my husband to go back with her ( without me ) but he insisted he wanted me with him.
I think in the 3rd year or so that she got better but she has very high expectation about how we live and so obsessed about the cleanliness. Now i'm 12 weeks pregnant and i miscarried once last year, so this time i'm more careful and follow the doctor instruction. What she keep saying is I'm worry too much, she told her daughter who's used to be midwife that i'm bloody worried. She said she knows about pregnancy and i'm suffering from the first miscarriage. I was bleeding last week and i went to see the doctor and i had internal ultrasound to check if the baby is ok, yes the baby was fine and she said the same thing i'm too worried and she knows what she's talking about. She doesn't know my body and my pain.
Anyway, i don't like her attitude and she's so bossy and fussy about everything. I'm not happy to have her around. She's gonna buy a house here close to us and she can stay here longer. It's gonna push me too far and i don't know how to cope. She's been a lot better than the start but i still don;t feel comfortable with her at all. She upset me too much for too long before and still does. This house is not mine when she's here. But i can tell you that if she doesn;t get her own way, it would be the end of everything.
My husband is very good with me though. i don;t want to sacrifice my relationship just because of her, but sometimes ( lots of times ) she drives me mad