Family members that don’t want a relationship with your children

I am wondering if anyone has been in a similar situation with a family member and how they handled it.

My sister lives 5 mins away. She is older than me with no children. She has told me many many times she does not want children but her husband does. I have a 15 month old son she’s only met 4 times at family events. I could literally walk to her house in 15 minutes. I have tried about 10 times to drop by her house so my son can get to know his aunt and she will just ghost me, no answer to calls or texts. Before my son she never did this.

So we got in a fight about this 4 months ago. I was pissed she was making no effort. She told me I was over reacting and she wasn’t ignoring me and I’m just being dramatic. So I said ok how about we come over Sunday. She said that would be great. Sunday comes I call her 5 times and text 5 times. NO ANSWER! SHE GHOSTED ME AGAIN!!!!

Then the next day she sends me an email 🤔 saying that her phone died and she had to get a new one. The message said “sorry did you get my message? My phone won’t hold a charge and I had to get a new one”. No sorry. She has a home phone. She has a husband with a cell with my number in it. She also lives a 5 min drive away. So it’s pretty obvious she doesn’t want a relationship with my son. He doesn’t even know her at all. She hasn’t seen him since he was 10 months old. My own sister.

My husband thinks it’s because sometime is going on with her and her husband about the not wanting kids thing. My son is an ivf baby so she knows how much I struggled for him. I’ve asked her a million times if they are having troubles conceiving but she is adamant that she does not want children that’s all.

So my question is have you ever had a family member totally ghost you after you had a baby? How did you handle it? Should I just ignore her and not care or should I keep fighting for my son to have a relationship with his aunt?