I think she is scared and does not know what to say like the other people have mentioned in their posts to you.
She may also be feeling a tad guilty as she was your friend yet did not see the pain you were in.
Give her time. She will come around. Right now for you, try not to contact her for a while. Let her come to you. She is afraid and does not know what to say so she is doing nothing. I know this hurts you now but give it time. She is a friend and she will start to feel better and you may hear from her soon.

Meanwhile do all you can to stay well