"the most plausible scenario is that she presented herself to him as entirely willing" means that "most likely she told Minsky that she was entirely willing [an

"the most plausible scenario is that she presented herself to him as entirely willing" means that "most likely she told Minsky that she was entirely willing [and not being coerced, and Minsky didn't doubt that]". I can't see any other intepretation of the statement. Whether that's a reasonable things to expect from Minsky (or whether we want to hypothesize at all on what happened) it's up for debate, but the formulation doesn't seem ambiguous.