SISTER IN LAW

Hey guys i just wanted to see if i am being dramatic or have a reason for feeling some type of way. So long story short in the beginning of my husband and i relationship he had an affair with his ex wife. Fast forward to counseling and repair. My sister in law and i talked. Ive cried to her , explained my side as the ex wife also needs to be held accountable as she knew about me and didn't care saying i know my vagina wont make you love me etc. Hugged me while knowing. My sister in law would say things about the ex wife saying shes fat, shes mental you have to treat her as such, i don't care for her.

So fast forward my husband and his ex wife is now in a new custody battle in which the sister knows. After my husband has asked the sister in law to cut ties with the ex wife she sneaks and hangs out with her and stated its for the kids. She invites her to things and not my husband and transports the kids for the ex wife when she cant but says things like my husband shouldn't be getting help from me to transport because I'm the wife. I personally do not feel comfortable having a relationship with the sister in law because she literally was talking about her but now in her face 24/7 when they didn't have a relationship prior to them getting a divorce . How do i know shes not talking about me to the ex wife. Idk am i being dramatic?