Pretty dangerous for the wench, I imagine. Depending on her weight, you might need a weak link.

The Soaring Safety Foundation (US) should have the best info on this https://www.soaringsafety.org/ This is a very good resource for safety training. There have been some European and UK studies out there since they tend to winch more than US. Aero-tow kills more tow pilots than winching kills wenches.