Is this a common practice for pwBPD to carry out?
it is not out of the realm of possibilities - remember though, it isn't so much about YOU - it is about the idea of contacting you or hearing your voice is soothing some emotional response in her that may or may very well not have anything to do with you.
If so then why has she spoken now after so many silent calls, all be it just to say she had dialed the wrong number?
well, could be fishing trip on her part.
The other thing is we can get so sensitive to the stories we read here, that we may see things that are not there... . I mean, it is possible it was a real wrong number and the woman wasn't her... . that is a possibility, right?
Overall, how are you feeling? triggered?