I feel like I'm in a similar situation DS, a good friend of over 20 years has gone AWOL on me.
we both work full time, have DC's, she seems to have time for everyone else except me. I think I just have to accept that I'm not important in her life anymore and that she is investing that time in people who are.
I feel very very sad about this, we have gone from daily conversations, nights out, when we were younger, which became daily then weekly emails, maybe one night out a year, as we grew older, got married and had children, which was fine by me as I realise we're both really busy, but the odd email and night out kept us in touch.
I made the effort to visit her to give DC's xmas presents, said she was disorganised so hadn't written cards for mine yet, and had presents unwrapped for them. Really didn't bother me, no contact over Christmas and the cards are yet to appear.
I text happy new year and nothing back.
Whenever the subject has been broached in the past it's always come down to work/family/life too busy.
But when you're told by someone else that this person you've been friends with for that long, who is godparent to your child can meet people they work with for cuppa outside of work hours and yet you don't even warrant the couple of minutes for an email it hurts, it bloody hurts.
So, I like you, have decided I can do no more, I don't want an explanation as I'll get the same old same old.
I will move on and if and when she gets in touch I will be there for her, but in the meantime I will invest my time and energy into DH and the DC's and the friends who want to be part of my life.
hope this helps
elfsmum xx