My cousin in misery

Hi friends,
I am posting my cousin's problem hoping to find solution by u're valuable suggestions.
She's close cousin of mine, she's 3 younger to me, but somehow we became imseparable over the years, she's morethan a sis, which i don't have.
Comming to the point, she got married nearly 3 yrs back, now she's a mother of beautiful baby boy. Her problem is her MIL, she's been causing her a lot of problem, her husband loves his mother a lot so does he loves my cousin too, but he cann't go against his mother, I met her twice, when i went to india, she treats my cousin as a maid, she commands, she instruct her to follow her rules, if she misses one small thing r goes something wrong, she scolds, gets angry n stops talking, tht time my cousin not suppose to go anywhere near her MIL, if she accidently crosses her, she starts again, n make mess n adds to misery. Things gets worse when my cousin's husband goes to work in abroad (he goes quite often), tht time her MIL, locks locker, even my cousin's dresser everything, for even daily use clothes n all, she need permission to ask frm MIL everyday, small penny, jewells anything she needs to ask MIL, she not suposed to call her parents, not to watch TV, she's like house arrest.her husband didn't know all this, but last yr she got fed up n told whts happening with her, when he raised this issue with his mom, she said all r nothing but accusation, n starved herself to sick. Now even though he knows wht happens he still wants my cousin to bear all this, if she says anything he also blames her saying she's the reason behind all this n stops talking r keeps n saying this.
My cousin don't know wht to do? she's very soft, she grew up in a very well to do family,thought her good morals, she never faced anything like this before, she's not used to harsh comments, r being kept as a maid, as she had 3 maids in her parents house before,now she only knows crying, n cann't handle all this, all i can say is she's going thr' onehell of a time. Her parents waiting someday this will be over soon, their only relief is her husband takes her to abroad with him.
But she says her husband is unhappy, as they don't get along, now she wants my help to handle all this n to make him happy, as she loves her husband a lot, I asked her not to tell anything abt her MIL with her husband, stay strong n all but it's not working,so I am turning to u all. plz give u're suggestions, so tht i can give it to her make her pain go. I feel angry n frutruated on her MIL, she's well educated n worked as headteacher, i don't know wht she thought to her children,
txs in advance
shwetha