pregnant sister triggering meltdowns

Okay so ik a lot of people will come at me and say it’s her hormones or whatever but it’s draining me so much

My sister found out she was pregnant a while ago, she’s about 5 or 6 weeks but lately she hasn’t been doing anything around the house even though she hasn’t done anything around the house before she was pregnant and she gave off cause she had to

She’s also been snapping at me a lot, for no reason, mocking me because I asked her to get up and do something, calling me names and whatever

I’ve had several meltdowns in one week because of her and I’m so fucking exhausted

My mum won’t do anything about it, all she keeps saying is ‘it’s her hormones’ like she has no recognition that I have feelings and that I’m drained as well

I cook, clean, do the laundry and even look after the kids

I can’t complain when I have to get up and do something, but my sister is allowed to do everything I listed above

I was also in a very dark place last year, went to counselling and it helped but I’m so close of going back to that part of my life again

I’m exhausted and I don’t think I can keep it together anymore