So ladies question I need some advice on how to approach this situation me and my mother have always…

So ladies question I need some advice on how to approach this situation me and my mother have always had a rocky relationship ever since her and my dad split when I was 13 and I left to live with him my sister has always been her golden child bc she stayed anyways my mom has never really played a big role in my children's lives she's constantly in and out and that's fine with me...so here we are almost to May I haven't spoken to my mother since the beginning of march (my sisters bday) which isn't a big deal bc we rarely talk anyways her and my sister have been arguing over a car my sister bought from her my sister has been venting to me but I still have no communication with my mother fast forward to today I made a Facebook event for my LO 2nd birthday that is next weekend mainly so I can invite her since the rest of mine And hubbys family were told on Easter well I went to invite her only to find she has unfriended me I'm not really hurt by it more confused as to why she unfriended me when I have nothing to do with it and that was literally her only way of seeing my children should I just not invite her to the party or is it worth texting her and letting her know about it I asked hubbys opinion but he's never really liked her so I feel like his opinion will be based on negative feelings sorry for such a long post....