I don't understand

I've been struggling mental illnesses for awhile and my mom knows, but just brushed it off as apart of my epilepsy.. Recently my brother was released from the hospital for self harm and I am here to fully support him. But some days she will make comments about how she would be lost without him and even told my brother that if she won the lottery she would buy a large house for her, him and my other brother..while I am just shipped off. I know that shouldn't matter since I'm a legal adult now but I've always been the one left out or picked on. I am bigger since I was a child and she will often make shady remarks it got really bad in hs that I would only it a pack of Lance peanut butter crackers a day. I've been doing better now with my thoughts later but now being around her so often, it's been going reverse.

Sorry for this long ass post✨