What does Isabel say Mrs. Lockton is set on doing to her?

I believe that the quote in question can be found at the end of chapter 41:

She was set on keeping my arms and legs dancing to her tune and my soul bound in her chains.

Just before this quote appears, Isabel is imagining a couple of scenarios. Each scenario has one end goal: Isabel wants to be free. At this point, Isabel is thinking of ways to legally accomplish her goal. She has heard of other slaves buying their own freedom from their masters, but Isabel has no way of earning money. She tells readers that some slaves have a day off on Sunday. Isabel wishes that she had that, because it would allow her to hire herself out for pay. She could do that enough times and earn money to buy back her freedom. Unfortunately, Isabel knows that dream isn't likely to happen at all. This is because Madam Lockton controls every single part of Isabel's waking moments.