Yeah, I agree with this. If it's a day or two after, then maybe a tidy message to say that's life and you've not got any hard feelings for her. It happens to everyone.
Any point more than a few days would probably be too annoying to be worthwhile. Would show that you're still thinking about this when perhaps she's no longer doing.
As she was the one who cut you off, I think it's up to her to decide when and if she wants to speak to you again. And if/when she does, it's up to you to decide whether you want to accept it or not. She had her reasons for ending it, so unless those have gone away, they'd still be preventing her from wanting anything to do with you. Let her resolve that. In the mean time, forget her and enjoy your life and your friends.