I just lost my mom...What to expect from friends

I lost my mom five days ago and am just wondering what to expect from friends. I've never lost anyone this close to me before, and so far I've been lucky to have a few friends reach out to me.

But I also have a few friends that I really expected to hear from. Particularly a friend I've known for 25 years who also lost her mom. I was with her the night her mom died (of cancer) and I supported her for the whole time her mom was sick. All I got from this friend was a comment on my facebook status about my moms passing. Another friend came out for ice cream (a few days before my mom passed) and said "oh I was going to call you", but never did and hasn't reached out at all so far. 

I feel like I have a new appreciation for the people in my life who have been so kind to me and supportive. But on the other hand, I kind of feel like maybe letting go of some friends who haven't called or messaged me to give condolences.

Anyone who really knows me, knows how incredibly close I was to my mom and how completely overwhelmed by grief I am. Is it normal that supposed close friends just don't reach out? I can't understand this. It really hurts.