You're talking about a serial blackmailer vs. someone with one victim, which are different enough, imo, regardless of motives. I think it's possible for a blackmailer-for-money to also focus on one victim.

As for the "she felt her done her wrong" Wah, wah. That happens to a lot of people. Most of them don't resort to blackmail.

Ok, I retracted the whole, "she was no longer an adventurer" thing, so I'm not sure why you're still mentioning it?