I recognise your situation. My granddaughter just turned 1, and I am sad about the limited contact that we have with her. We see them about once every 6 weeks, often in a big family gathering rather than one to one. We live about 80 miles away, so its not so easy to pop in, or for them to come for the day.
My daughter in law's mum goes to stay with them every 3 weeks or so, and I was getting rather jealous about this, but having talked to her last weekend, I am glad that she is there to offer support, as DiL has suffered from postnatal depression, and huge anxiety about going back to work, and the baby still doesn't sleep well, which would wear anyone down.
I am trying to play the long game- say that I am available if they need help, would be happy to come over if baby cant go to nursery, etc. And of course, I don't make any recommendations of how to do things..The advice people have given on this thread is really helpful.
There are no hard feelings involved that I am aware of, far from it, we get on well when we meet up, I think it is just that it has proved a stressful year and DiL wants her mum, rather than her mother in law.
I hope that as she gets a little older, our granddaughter will have and remember fun times with Dad's parents, and want to spend time with us.
It is sad though, not to be able to share these early months as I would like to.