How do I make my mum see she being unfair ?

Hi feel my future going down the pan. Me and my mum on benefits Because of our have disabilities my with hearing problems and short term loss. I unfortunately can’t move out as my mum can’t get a part time job she been trying she been a carer most of her life. She is over She in her 60s. I might have to wait till she 65 before I move out.

Me and my boyfriend Even my mum was in a agreement at one point but not anymore. We had this plan of bf together moving into my mums like a trial 3 months see how it goes. But I found out my sister has got problems She can’t be left on her own much. she finshed college and now my mum picks her up most days Takes her back and forth to ours . Even when unannounced And I had plans with my bf in afternoon . My mum then says to me with plans of m my bf moving in she says it can’t happen. She says he won’t be able to cope with the spontaneous lifestyle she has living here. because my bf has autistim She just says my house do what I like. She was very rude about it.

As do I we both struggle with change and last min things. I feel my mum stopped accommodating me and my bf. For wanting to try. Fact my sister Got appointments and paperwork mum is trying to help her find a job.
I understand that. but wanna know if there any hope in getting her to understand I live under same roof.