About 5 months back, I sold my laptop to a friend. It had started collecting dust in the corner when I started working in an office so I figured that I might as well sell it and get some cash out of it.

She was tight on cash at the time and asked if she could pay it in installments, which I didn't mind. It was $20/month until she paid off the total of $100. Not that much, right? (another friend said that he would've paid for more it, but that's not part of this discussion) 

Fast forward to today and She still hasn't paid me in full for it. If anything, she seems to have settled for not paying me back at all.

WIBTA if I repo'd the laptop?