Mother and sister-in-law

My mother and I used to be extremely close and always did everything together but when my brother started fainting his now fiancé everything changed. We barely talk even though we live in the same house and never do anything. Meanwhile her and my brothers fiancé do stuff together all the time. Just in the last week they have gone to lunch twice and have gone and got their nails done. All while I was at the house. I wasnt invited to go or even told that they were leaving. Lately I’ve just been feeling like an afterthought and just been kind of upset about it.