I am so very sorry for your loss. My mom passed 3 years ago, just 4 months before my wedding. My mom was my best friend. I miss her every single day. For the first several months I'd absent mindedly pick up the phone to call her, then just dissolve into tears as the reality hit. Daddy passed in February of this year. He had cancer and was completely bed ridden. DH and I moved him in with us and cared for him the last few months of his life. It was the hardest and best thing I've ever done. I started missing him a long time ago when the cancer and the meds started to take him away, but I treasure the moments of clarity he had with DH and me, and smile when I think about them.
I found a bereavement group at my local Hospice (I volunteer there as well, but not in a patient area). That group really helped. It was just daughters who have lost a parent and it was so helpful to hear others' stories, get support from them and give support to them. A reputable Hospice will not let you join a group this quickly though, but one-on-one counseling is available and it really helps.
You will miss her every day. But every day it will get better too. I know right now it seems like your world is crashing in and you will never feel better, but I promise, just keep going one day at a time, and it will get better.