So sorry gilly to hear your mum died before your daughter was born. I know EXACTLY how you feel as my mum died four years ago when I was nearly 20 weeks pregnant, after a long two year illness in a nursing home.
I too remember all the emptiness when I was bringing up my son Joshua that first year. It slowly gets easier but I didn't get enough help, I became a single parent so my isolation grew.
All I can suggest for now is don't let yourself become too isolated somehow i.e. speak to Cruse, read material (if you get time of course!) from their website, poetry can be helpful as it is reflective and gentle on the soul. Try and find people who have been bereaved who you can talk to. I can honestly say I didn't and still don't get support from those who haven't been bereaved, they have no idea. At least that has been my experience.
I isolated myself more and more as I became a single parent too when Joshua was five months, although I get on well with my ex he isn't too much of a problem, but single parenting is doubly isolating in its own way.
I am still on my own now and the reason for this I believe is because I did not get sufficient help when I needed it. I am now waiting for Cruse counselling on a one to one basis. I am an only child so I guess that can make the isolation a bit worse.
I am too used to isolating myself and avoiding people, I think a lot of it is to do with my mum, I hope these words help you a little and I want to know I feel for you and totally understand the emptiness.
It does get slowly less and less of a trauma although I do feel very bitter that Joshua has been deprived of a grandma and I have lost my mum who was a true friend who loved me deeply. I am just having a downer at the moment I think it is because it is summer and we are supposed to feel happier when the sun is shining and I just don't!
I will keep coming back to this message board to check you are okay.
Until then please bear in mind you are not alone.
Take care and wishing you all the very best.
chattysoul x