During DH call to speak with BM about some of the horrible things she has said about me to the kids, BM denied saying these things, of course, and then proceeded to ask, "I don't understand how come we [as in BM and I] cannot be friends".

Uh, let's see, in the two 1/2 years DH and I have been together, I estimate BM and I have spoken no more than 10 words to one another. And to be clear, that is probably an over estimation given that the only time I remember us actually saying anything to one another was at a birthday party when she asked me to help pass out cupcakes and I probably said something like "sure" or "no problem". Other than that, we have seen one another no more than 5 times and I imagine we MIGHT have said "hi" or "hello".

Not only have we not ever held a decent conversation, but BM continuously makes up lies about me and shares these with the social worker as "her reasons for wanting DH to lose custody of skids".

To add to that, BM sends rude messages through the kids, even after being asked/told to stop more than once.

She's kidding right?! Not that I believe BM wants to be friends with me, but is this supposed to be her way of making friends?