AITA?For making my cousin cry?

Im 24 Female and I know the title sounds stand-off -ish but just recently my now husband asked if I can get my side of my family to take a 2-3 hour drive to our house I of course agreed because our familys never formally met so I thought what can go wrong well my cousin let's name her Mina 24 Female is 32 weeks in her pregnancy and not to be speaking rude about her but she can become such a Bi*** at times but people in my family say its "pregnancy hormones" I say thats all bull and feels as if she doesn't feel comfortable around me or hates me and trying to get me to understand but not being specific thats she feels that way and when I sent out the information for the gathering but then my cousin being the Little b she is said " well I can't drive because then sending a picture of her belly and then continued to say well maybe you can pick me up I said why would I do that if im hosting it she said well then im not coming and knowing my family will question Why she is not there so I made a plan I went to pick her up and when we got to my home she said wow its so big it's enough space for me and my baby and mind you she is a single mom and when she saw my husband she ran up to him and gave him A KISS on the cheek now who would give there families husband a kiss on the cheek? That made my blood boil then at dinner she made snarky remarks saying "your to fat to have a such fit husband " mind you im fit skinny body looks like a goddess that was alot to say from her have a miscarriage drug addiction and felonys on her record thats when I snapped telling how I felt to how she is such a pain in butt and is a mistake and wish she was never my cousin So am I the A hole??