This reader question immediately brought “Mafia Captive” to mind, but there is no way this reader could have missed the “captive” part of the story when the bad-guy she was hiding from finds her. Since she did not include that part it in her question, I don’t think my guess is the right one.
Wait… another book is coming to me. I read it. I liked it. A fight in the alley outside of a bar. Was it a rock star? Two opposing rock stars? YES!! Okay was that it, or is there yet another book that she might be referring to?