We have a Bengal at work, very friendly when she fancies it, utterly aloof if she doesn't.
The thing is, we're some distance from any houses and we are a secure site (though I'm sure there's ways in if you're a cat!)
The cat appears to be young, in good condition and not unduly stressed. She has however been trying to get into the building over the past couple days.
There's plenty of wildlife around that could sustain a stray cat and I believe Bengals are accomplished hunters? Is it likely she would stray a long distance regularly or is it possible she's lost / stolen?