There is a mutual no contact order between my ex and I. I text with my daughter and she is told by her mother to tell me this or that to try to get me upset. Latest being some BS about my dog being deathly ill and needing money. I bet it burns her ass that I totally ignore it when it happens. I simply tell my daughter I won't use her for vindictive and petty purposes, I love her and I am in NO way upset with her for any reason. I think my ex is getting more insane by the day. Isn't love grand!
How old is your daughter? Old enough to be innocently used or complicit? Her proper reply to this woman is, "I prefer not to get involved" and Not pass it on!
Unless she is a young minor, in which case I would lodge a complaint with DCFS (or whatever in your state) as it IS mentally abusive of her mother.
Period.