I've just the plot:
Young policewoman gets the task to espionage a gang dealing with counterfeit money. The money is passed thru gambling houses, led also by a woman.
The policewoman has a male Inspector backing up and deals with a small criminal to get in the underground.

Movie was made in the 70ies, i think around the middle or before. It's a rather small budget. Not any well-known in the cast.

I know, it's not much, but....Any hints ?

Sounds like just about every Cynthia Khan movie plotline. I would try to look at her filmography and see if anything stands out.

well,i know the plot isn't anything special.
but i said something about being made in the 70ies, so it's surely not cynthia khan.