Hmm,
It's difficult to say, we're short on details, but no, you aren't being stupid. Signals can vary from relationship to relationship; some are hard to distinguish, especially when two people are as close as you two seem to be. From what's been posted, those "signals" can mean anything from liking you to just being comfortable around you as a friend. It's moments like these that you have to step back and look at the friendship itself, you can't rely on those gestures alone. They're only a part of the equation, you need to take into consideration her personality, where you stand with her, how long it's been, and several other factors. It's looking at things like these that keep you in perspective, because while it may be important to act on instinct, it's also important to make sure you don't get ahead of yourself. It's something you'd want to be sure of. Certainly, there's always going to be a hint of risk, and the risk is worth it, but as I said, it would help to be sure of what it is you're seeing, because if you're wrong, it could make for a very awkward situation. Then again, you don't want to let that ship sail by either, that's the fine line you need to walk along when it comes to relationships. It's a bit of instinct and a bit of perceptiveness, and a bit of nerve, and being able to manage all of those into an outcome you can live with. Feel free to post any more ideas you have, some more clues would help in coming to a conclusion.