There are lots of ways to bring something like this up, assuming your therapist isn't a complete numbskull (and it doesn't sound like she is).

You could ask: "What kinds of things would cause you to report something to law enforcement?" That would lead her to state what she's mandated to report and also clue her in that something is going on that's potentially putting you in danger.

You could make a statement that would lead her to ask you questions back, such as, "There's something that's still happening and I'm frightened." Or "That thing we been talking about is still happening." Or, "I'm scared."

Any of those things are enough to clue her in and help you talk about this. If your main concern is that this will be reported, but your life is at risk if this person isn't stopped, talk to her about what would happen in a hypothetical situation of abuse.

Bottom line, you need to be safe, and your therapist should be able to walk you through what can be done to make that happen--both on her end and yours.

On a side note, there are rules in therapy? Mine has only given one--not to wreck her office. (She gave another rule, but I broke it already...twice.)

eta: Nevermind, we cross posted and you answered the question about reporting. I would let her report, and talk through next steps so that you're really clear about what will happen and how you can be safe from the fallout. There is only so much self improvement you can do if you're going home to abuse.