I agree that there is no obligation to pay attention to her, or pressure anyone to do so.

However, I note that some people just aren't good with kids, and that's okay. Sometimes it can be an advantage, where teens or new adults will connect with a relative who doesn't see them as little children from having helped raise them. But it depends on the kids whether that appeals to them.

I would ask, what can she do for them? If there are practical benefits not just social ones, if she can meet a need of theirs, it might make establishing a relationship with her more attractive to them.