Am I wrong for cutting off my sister-in-law after her cruel message and drama?

Am I wrong for cutting off my sister-in-law after her cruel message and drama?
So I’m going through different settings on my instagram. I stumbled across an old message request from my husband sister. She says “psychiatric help is free. Use the resources, we don’t know you”. Her current instagram is deactivated. Nevertheless we already don’t speak because of drama. She was last to find out we got married. I decided not to interact with my husband family because of the drama. His sister keeps in contact with husband past exes and it leads to more drama. Then she mentions in the message about me photoshopping photos of me and my husband. She keeps apologizing to me about the message explaining she didn’t know. This message comes before finding out we got married and meeting me.
Am I wrong for cutting off my sister-in-law after her cruel message and drama?
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