So sorry to hear about the loss of your mum Kittycat
. I lost my mum a couple of months ago and for me her death highlighted our estrangement from our son and only GC.
I think jaylucy's advice is spot on. Having done so much, for so long it's going to be really hard for you to take a step back, but you need too for your own well being, especially as you are dealing with your grief over losing your mum.
You are not alone, there are several EP's/EGP's who are regular posters here on GN and as Iam has suggested, you might want to take a look at the support thread on this forum.
It looks as if your D needs professional help, help which as much as you love her, you'll struggle to provide. As Nonogran has said "It's ok to be a bit "selfish" sometimes", and this is one of those times.
Take care and if you can, let us know how you're getting on.