My MIL doesn't believe I'm still getting morning sickness...

So quick rundown: we rent the second floor of my MIL's home. She likes to have us do things for her and she useually takes money off rent for it so that's fine.

I'm 23 weeks pregnant and still pretty sick. Like I can work but it's a bit of a struggle. Just very nauseated most of the time and tend to spend the first 4 hours of my day puking. And I have this weird pregnancy related hip pain. I work every other day so I work and then the next day I'm kinda out of commission.

Annnnnd my MIL is pretty annoyed with me. She thinks I am just being lazy and has told me countless times she wasn't sick for this long with her pregnancies.

I've tried to be nice about it but honestly I'm getting sick of it. I'm not her slave and we pay fair rent to be there. She is just annoyed because she hasn't had to do her own yard work or house work in years with us renting from her.

What should I say. I know she thinks I'm lying but I'm really not. I'm exhausted and sick and the last thing I need is a middle aged woman accusing me of faking it.