Sister in law two face?

Well to get straight to point me and husband have been married 3yrs during our wedding I asked my sister in law to be bridesmaid and she declined and said"it's because of her weight and that I could use her kids if I want in the wedding" not that's she's obligated but we never really heard from her until the wedding day, do I brushed it off as maybe she is self conscious of her weight..

A year after our Marriage I wished her happy birthday on fb and she responded to everyone except mine again I brushed it off.

Then last year we had a BBQ in December (few days after Christmas)at her parents house and it was AWKWARD she was very standoffish and I could feel the tension... On Christmas day my husband went to her house to give his neices there gift I couldn't go due to work but she did give him a gift to me

So on the day of the BBQ after the awkward BBQ when me and hubby were leaving I told her bye and have her a hug and thanked her for the gift and as I was walking away her husband asked"what did she say" to her as if it was a problem ,mind you he hardly ever talks..

Now this year I'm pregnant she has avoided my sister text for the baby shower of needing her address to send a invite but me and my husband know she received it because she just invited my husband to her best friend wedding yesterday so my husband went just to see if she was in the wedding and guess what she was A BRIDESMAID in her bf wedding but couldn't do it for I and her brother wedding ,I didn't go because I'm still pissed at her avoiding my sister text and also just disappointed because MY husband's first cousin offered to do the baby shower and he hardly talks to them so I thought that was extremly nice of her do so now her and my sister are planning it together..

I want to know is it just my noticing the shade because when she's in my face its like she will greet and ask how I'm doing, but I get the vibe she doesn't like me and I have absolutely no clue what IV done to her I'm a person that don't have much friends because I don't like drama and I mostly keep to myself..

My husband feelings were hurt when he saw her walking in her friend wedding but couldn't for ours , so now he's wanting to talk to her I don't think he should I think we should just move on with our lives and if she chooses to be in my son's life great, if not that's fine also.

Also I'm black and my husband is Hispanic

So idk if that has anything to do with it although she claims to have black friends

Any advice will help thanxs ☺