Aita for not caring so much?

Long read (I tried to explain best I could when English is my second language)

So I have two boys 4 and 2. Husbands sister has girl 1 year and newborn boy.Now before she gave birth and even before she was pregnant I called often on face time to see her little girl and my kids could see their aunt and niece.Didn’t call ever day we called one or twice a week she doesn’t respond we hung up and we go on our day.But we have family Snapchat and every time someone send something she would almost immediately respond.Now when she does answer FaceTime my oldest wanted to talk with her and to show her his new toys and when she has enough she will say okay I have to go now your cousin wants to take nap my son will say okay bye auntie and go on his day.Since she got her girl she maybe called us first 5 times.Now when I want to come by I text earlier ask is it okay and if they have something do to 7/10 she would say oh we aren’t home or getting ready to go somewhere . No big deal I have kids i know she wants to have time with her daughter outside (she is also stay at home mom). Now what hurts me is if her mom needs something she then calls and text oh can you go there and help her or buy her something m.No big deal if my kids aren’t napping I will go.Then she got pregnant with second child and I know it is tireing with small kid and pregnancy.Gave birth I went later after she got home I brought some food and hold her baby for two minutes until he started get fussy and she went to prepare bottle her husband took kid immediately,no biggie your child.And I texted couple time after that called maybe twice or three time on face time never replied.And I just gave up tbh.

I asked my husbands other niece (from his brother) does she talk with her aunt she said yes they FaceTime I’m like okay

Now to recap:

*my oldest love her and his cousins and he ask for her all the time and to see her

* I don’t call every day 10x a day,I’m calling twice a week

* when she shares her kids on Snapchat I woul save those pictures in chat she never does that or just opens mine and doesn’t respond anything (if it something interesting)

* I feel I try more with her kids then she does with mine

Aita for stoping to try to have any relationship if it’s forced ?