Feeling unwanted

should I give up on my mother? When I had #1, she only appeared less than 5 times a year to see us. When I had #2, she just mia all the way. She uses the covid issue as excuse, but she didn't even bother calling or messaging us to check in on us (phone also kena virus?). This month is #1 birthday, she didn't even call or message to wish him Happy Birthday. What she did was just paynow my hubby. She thinks pay membership fees to be Granny sia. I'm damn pissed. On the other hand, my sil has been posting photo of outings and meals with her on her social media.