I totally understand the anger. I wrote heaps of crap on facebook that i am sure people were worried about but my thought is better to put it out there then bottle it all up and then end up a basketcase. She probably thought she was just worried but surely she could have just come to you and talked to you herself?
When you lose a child it makes other people uncomfortable and they say stupid crap instead of just letting you rant when you are angry with the world!
I had my dad tell me after i lost my son and was pregnant with my daughter that he had read an article about how fatter people are more likely to have stillborn children! From his point of view he was just trying to encourage me to lose weight and from my point of view he was a total ass hole that just made me feel responsible for killing my child....

Maybe reading that message has brought back all the anger that you had back then as well?