I was blocked, but message is now saying delivered on iPhone

So my ex best friend got mad at me and blocked me on everything including iMessages, and I text her last night and my messages were just blank. It didn’t say delivered and then right after I got off work, my message said delivered, but she told one of my friends that she never unblocked me but why would it say delivered if she never unblocked me

[Re-Titled by Moderator]