She seems to be sending signals that she is not interested in the friendship anymore. Did this 'bad' friend tell you to stop calling her or was that what your best friend suggested you should do?

Because your 'bad' friend is sending signals rather than directly telling you the friendship is done, I think she is probably the type of person who does not like confrontation. There's a good chance that when you confront her about this situation, she will lie and say that 'nothing is wrong.'

I am with your best friend. I would just drop this person. Let her get in touch with you if she wants-- and, yeah, when you make plans, ask her to call if she is going to be late.

Or show up late yourself. I have some friends who are late 90% of the time, so now I just tack on another half hour to whatever time we said we'd meet. It actually works out pretty well -- it's a lot easier to change our own behavior than to change other people's

Someone I thought was a good friend dumped me in this way, by not answering calls/emails/texts, suggesting plans and not following through. It really sucks. I felt a lot better when I realized she wanted out of the friendship and I focused on finding new friends.