I accepted the "Kill maria" quest and went to go find more info from her about getting her riches back. Problem is now she won't talk, I keep clicking but nothing is happening.

I am going out on a limb and guessing that it's a glitched character.

Anyone came across this before?

That is why she will not talk to you. Reload a save before that, if available, and you can decline the quest and talk to her, or go talk to her first.

That's a bit harsh design.