Please be careful. Think about the fact that you/your child could be rejected without hand - as a PP said: how do you know, that she doesn't already know about your child?
My DD (19) had no contact with her biological father, but for the first 8 years of her life she had a relationship with his parents and siblings. When she was 8, she told them - on a pre-arranged visit, on the doorstep, as soon as she'd arrived, that she wanted nothing more to do with them. As the years have gone by, she's admitted that they ignored her as soon as my father left her with them, they left her in the somewhat dubious care of her then 12 year old uncle whilst they entertained guests, they fed her food which they knew she was allergic to (Snickers bars when she has an allergy to peanuts, and peanut butter sandwiches... just before she was brought home: I have my suspicions that they wanted me to get the blame if she died, when - as much as I love peanuts and peanut butter - any products, or by-products containing them do not cross our threshold and haven't since discovering my DD was allergic). They also threatened me with going for custody of her (which she still knows nothing about, and hopefully, I will never have to tell her about!). When she started college - she ended up taking a restraining order out against them, as - as soon as she turned 18 - they started to hound her to resume contact. They vaguely knew one of the girls on her course, and convinced her to tell them all about how my DD was doing. They sent her post with huge wads of money in - and then, when she sent it back to them, telling them that she wasn't interested and couldn't be bribed into having a relationship with them, they blamed me for it. That, in itself, scared me. We'd moved since she stopped all contact - but still they knew where we lived! There was DV involved in my relationship with her biological father.
Her biological father, meanwhile, has apparently married, had other children, declined to tell either wife or children about my DD, and has no interest in her whatsoever. He's certainly never paid any maintenance and he's not on her birth certificate. I was running for my life when I left.
His parents have made my DD's life a living hell. She cannot walk through our small town without fear of bumping into them. She cannot go to work without a niggle at the back of her mind that they might turn up to dine at the restaurant - and she'll have them in her section. And it is a genuine fear which she is now undergoing counselling for. She rejected them... but with good reason from the little I've been able to gather over the years.
If your DC's own father wants nothing to do with them... then leave it. You really do not know the can of worms you could be opening.