He shouldn't have worried about his money so much. She knew how to pay off her debts.
"Your work is most unsatisfactory. I'll pay you off at the end of the week."

I think your last sentence is a bit ambiguous, Maj. We all know how to pay off our debts (I think), but some of us try and hold off till the last minute. Then again, others just ignore their debts. Maybe 'She always paid off her debts, ultimately.' may have been better. I dunno.