I have 1 D, a SIL and 4 GCs, who live 15 miles away. When they lived in the same town I was a constant visitor especially as my D had problem births. When they moved 8 years ago, I refused to move with them as this put time and space between us. As I don't drive, it's an hours bus journey on country roads, and the bus runs every two hours, last bus, 5pm.
If I babysit it means an overnight stay which the GD love, they call it "Nannies sleepover".
Until they moved, I was on call 24/7, and this led to a horrendous argument one morning and I walked away, I'd finally had enough of being used and taken for granted, then being threatened with not seeing my GDs was the last straw.
I never contact my D after an argument and it was 3 days before she rang me. An hour later we'd sorted a few things out but not everything so I was still not happy. An hour later she called me back, very excited, they'd been offered a 3 bed house in a nearby town, did I want to view it with her?
That half hour car journey cleared the air further and we both worked hard to rebuild a proper mother/daughter relationship.
I now visit once a week, with extra thrown in for school concerts fetes etc. I'm also the only one my D trusts to babysit. With an 11 yr old who is ASD/ADHD and the 6yr old with life threatening allergies and a 9yr old who is a talented dancer/singer/actor, and the 16yrs old about to do GCSEs, life is very hectic.
Both my daughter and I have worked very hard to create a balanced relationship and like others, we are in contact with each other through phone, Whatsapp and texts as well as phone calls.
I think it is important to be honest and open, telling each other what you think, how you feel and what you expect from each other. If there is a misunderstanding or disagreement, don't let it "fester" and damage your relationship. (This has happened to my sister and her adult son and they no longer see or talk to each other which means that my sister has little or no contact with her GD).