Ok but this kind of thing is annoying.
on that can you stay out of it and let her find out herself?
but generally I think part of this is acceptance and then another part is being more confidently pro active in your relationship with them.
i recognise the dynamics you describe, I found my dad easier as a young adult vs my mum who was needy and looking to me for validation (which you are doing, a bit)
for example, at university my dad didn’t call me much (or i him and he didn’t seem to mind). But he would come and see me twice a term. He’d call and say ‘I’m coming to see you in the next week or two. What evening is good for you, I’ll book somewhere nice for dinner?’ Clear, assertive, offered me a nice dinner.
still now he’ll suggest doing something - seeing a film together or an exhibition, or something g he thinks my kids would like, and then make the running to organise and book it if I say yes. Takes it graciously if I say no. My mum has no ideas, and expects me to do all the organising.
and in general she was much needier ‘I never hear from you’ ‘when will I see you’
i know you’ve said they are moving but you could for example say:
’id like to see you, I’ll come over and take you out for a meal. Is dinner or lunch best? Which day?’ And then book somewhere they’d like to eat and show up.
its not their fault you are working ‘seven days a week’ and you don’t need to go to where they live to visit them.
you have to make some running and make reasonably timed suggestions, as you would with other adult friends
maybe their dad now treats them as the adults and equals they are which they find easier? I know I did.
with your DD moving away - once she’s settled you have to take responsibility for planning a trip during which you see her. So organise a holiday for yourself with opportunities to see her in it. Don’t expect to stay with her for weeks and weeks (maybe a few nights spaced out). Maybe invite her to join you at a nice holiday resort in the middle and offer to pay for that. But spend plenty of the trip doing your own thing off exploring, don’t rely on her to host / plan / entertain you.
and then she’ll enjoy it and want you to visit again.
if she’s really going to have her kids there i would plan to get to know if. Scope out airbnbs I could book for extended visits, and eg whether I could work from there to support that.