For clarity's sake, I have no idea what happened those decades ago. There's nothing at all to go on. Nothing about her story strikes me as inherently implausible, since that sort of assault happens time and again all over the country. Nothing about having forgotten a bunch of details strikes me as particularly implausible, although it certainly does call the reality that memories are tenuous. The ephemeral nature is going to be a concern in any sort of report from 30+ years on without much that could even potentially corroborate any version of events.
What I've commented on isn't what happened, but whether Ford is behaving like I'd expect someone that thought they were telling the truth to behave. At this stage, I don't think she is doing so - she was invited to speak and replied with a set of conditions that read like an invitation to turn her demands down.
I'll certainly grant that it's weak Bayesian evidence though. Her actions are just about as consistent with being honest and genuinely reluctant as they are with being unsure and concerned that she'll look dishonest.