My DD is 9. She has had a best friend X since nursery. They went all the way through school together and although they had a wide circle of friends they still considered each other to be BFs. 18 months ago we moved house and now live about 60 miles from our old town. The girls promised to keep in touch, swapped email addresses etc. My DH still works in our old town and his workplace is within walking distance of X's house so taking DD for visits would be very easy to achieve ( he regularly works weekends).
Since the move we have invited X several times for sleepovers - she has come 3 times with DH doing the majority of collection/drop-offs of X. My DD emails regularly but has only had one or two replies. During our summer holiday this year DD spent ages choosing and purchasing a present for X whose birthday is Sept. She paid for it from her own money and DH dropped it round after work ( posted through door) so we know it was received. DD received no thank you.
But X/ X's DM has never invited DD back. Her DM posted pictures on FB of X's birthday party 2 weeks ago to which DD was not invited ( DD doesn't know about the party) - even though it was on a Saturday and we could easily have got her there. When it was DD's birthday in May we had X for a sleepover as well as taking a small group of DD's new friends to the pictures. DD wanted it this way so that X would not feel left out by new friends who naturally X wouldn't know.
We know that X has a sporting hobby which requires training several nights per week and she often attends competitions at weekends so I understand she is time-constrained but it increasingly seems that she doesn't want to maintain the friendship with DD. Last night DD was in tears because she had checked her email for the thousandth time and still no reply from X. She really misses her and still sleeps with her picture by her bed. She has settled in well at her new school and made lots of new friends but X was always closest to her.
I really need advice on how best to help DD. I was very good friends with X's DM but I feel rude asking why she hasn't once invited DD over in 18 months. DD wants to invite X at half-term but I fear she is leaving herself wide open for more heartache when the invite is refused.I want to let her down gently but don't know how.