Were you saying there's no legal remifications for her? What if she contact my teem daughter?
If she does not harass, stalk, bother or molest your daughter and if what she does tell her is the truth, then she is breaking no laws that I know of.
Have you ever heard the old saying, "If you can't take the heat?"
The truth is what it is. You can't change it, you can't avoid it and you can't expect much success in denying it.
You can prepare for it. By this I mean it may be better if your wife hears the truth from you, rather than your scorned Mistress.
Or you can sweat it out for God knows how long and hope your ex-lover decides not to spill the beans about you spilling the seeds. But my guess is that the odds are in favor of her singing like a canary. If she happens to be a friend of your wife, she will do it under the ruse of feeling guilty.
But these are all the things you should have thought about before the fling.
Anyway, this is a free legal site, not a free relationship advise site, so I'll end my rant by saying, you went there, so now you must take responsibility for doing so.
Try to remember one thing, you're not the victim here, so don't expect to be getting much sympathy for the position you've put yourself in. That type of support will be going to your wife and child(ren)