~plan my funeral with me~

What you need to know:

I've been depressed for a very long time due to the fact that my family didn't know how to deal with my eating disorder and instead of continuing my therapy they decided to take matters into their own hands, but instead of talking to me and finding solutions it felt like they were just trying to punish me everytime I had a fall out,I did my research and found what type of e.d. I had when I tried talking about it with my mom but she told me 'then why didn't you stop doing that already, do you know the amount of stress you've caused everyone' I got agitated with what she just said and told her that my environment had a big factor in it, she didn't want to anymore so she walked out on me, when I told my older sister about how I've been feeling she came to my rescue and suggested that I come live with her in the uk my answer was undoubtedly yes, but my mom and other siblings didn't agree and tried to wi me over by saying stuff like 'we can talk about whatever's troubling you' and 'remember that we're here for you', they must think I'm stupid or something to actually listen to that bullshit, anyways since I've started living with my sister I've had no fallouts and I feel I've got to know myself a bit more

The problem:
Because my sister is travelling she asked my mom's coming to look after me and my niece, I'm scared that she's going to pressure me to talk to her about my mental health, she doesn't respect my privacy either so she's most definitely going to inspect my phone for anything unholy and sinful witch is going to result in her going to force to come home back with her

My question:

How can I try to stop all of that from happening, keep my mind intact and not have another fallout