Read all your posts and I think it’s the shock/realisation that she may never live full time with you again
Giving up the flexible home job - because she knows she’s not coming back
Kindly, I know you say she is your most favourite person in the world, but 1 - that can be quite pressuring, and 2 - she may not feel the same way
Are you still with your DH/DP - you’ve really not mentioned them much at all. Maybe it’s time for you to do things as a couple and for yourself
Find things to fill the gaps and don’t wallow in the devastation
I have 1 of each - dd on degree apprenticeship mostly at home, sometimes away and out a LOT! Then ds who left at 16 for army training last year, and we don’t see him for weeks at a time. Bit gutting when he gets leave and buggers off on a lads holiday instead of home - but we FaceTime and make the most of seeing him when we can
DH and I are doing more together, nights out and trips away that we couldn’t do when they were dependent
It’s the next stage of life. Ok to be sad, but being devastated and wanting to be back in the past is not healthy
Big hug and get planning something you will enjoy