I wouldn't believe you'd spoken to him if you tried to tell me that he'd gone on and on about how they filmed the scarecrow scene five times, and he nearly froze his jewels off ...
That kind of thing stretches the plausibility just a touch. You may have no reason to doubt her, but "we" includes me, and I have plenty of reasons.
Either Tom lied to her, or she's lying to everyone. Per you, I shouldn't call her a liar; but that means I have to call Tom one. The only fair option is to say they're both lying liars who lie.