Why can’t I stand her?!

Why can’t I stand my soon to be sister in law?! She hasn’t ever really “done” anything to me to make me dislike her, I have just never gotten very good vibes from her since the second I met her. She seems very insecure and manipulative. I’ve always been civil with her because I know my husband doesn’t want me to look like the bad guy. There’s been several occasions where I very well could have a reason to not like her.

For example; she doesn’t work, she is completely dependent on my brother in law, 110%

Anyway they came shopping with us and I was hunting for this very specific diaper bag I had been wanting before I even got pregnant, it was over $200 but I picked it as my birthday present so we went to buy it. Under her breath I heard her say “really $200 for a bag? Why spend that much money? Can they even afford that?”

Keep in mind my husband and I both work, we are very well off while her and my brother in law are very dependent on both their parents, they can’t even afford to live together.

She always does little things to push my buttons.

Am I the only one who feels like this? Please tell me your stories!