You'd have to introduce evidence that the conversation was not genuine, just as the mother would introduce evidence that it was. The court then has to decide which evidence is more credible and believable. Your testimony is evidence itself; but the mother will be introducing her own testimony as evidence as well, so you'd want something else to swing the balance. It probably won't be your 8-year-old's testimony, though - most courts would never, ever let a small child testify for one parent against the other. You should consult in private with an attorney who practices in your area to discuss your options.
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Whether to introduce a child into such a heated matter is obviously up to you, but, respectfully, you should take a long, hard look at doing so.
That aside, her DV form and any and all attachments need to be examined closely. I would get an aggressive lawyer as soon as possible. This matter should not be taken lightly. A TRO will show up on your permanent record, and that's obviously not good. Good luck with this.