It's natural to get crushes on teachers, and for teachers to get crushes on students. But as long as it remains a crush, and you don't do anything about it, you can continue on flirting.
But yeah, don't do it. You spend a lot of time with this instructor, but in only one (professional) context. You don't know her.
Basically, it's a low-percentage shot, with a lot of bad things that can come out of it.
Then again, while I haven't made exactly this mistake, I have made ones in analogous cases, and at the time, nobody could have stopped me. So just remember that when we're saying "Don't do it", it's because we've been there. Acknowledge it, and cheerfully go and ruin your life.