The first time you did exactly what you are criticizing her for--you forgot to confirm.

Then she did you a big favor.

Why block and delete? Then you guarantee that she will never contact you. I'd not block and delete a person who rescued me when I ran out of gas.

An alternative is to wait and see if she gets her act together and contacts you. If not, I'd give her the benefit of the doubt and say that she is flaky, not that she is purposely mistreating you or does not want to be friends.