You are still grieving so don't be so hard on yourself or expect yourself to feel "hunky-dory" by now...
This woman was very important to you and you've already done a very wonderful & positive thing by sharing your memory of her with us.
That's one thing you can do to keep someone's spirit or memory alive - to share what it was they gave to you here on earth with others.
You will tell YOUR children about her someday and in that way she will still live on - I can't tell you how much I believe this. My Dad died 3 years ago and sometimes I just know that the love I had for him and his love for me (his #3 daughter) is still as alive as it was when HE was alive.
And how special is that!!!
If you can, please share a little bit more about what your friend's mom was like, ok??