I concur that you should talk to her and try to establish something that satisfies your needs within your relationship. Before having the conversation, though, try to have a very clear understanding of what it is you want and what you think her reaction will be (don't get too set on what you think her reaction will be, though, because she might surprise you). Start with talking about something small and non-threatening to her -- something more playful and fun.

You identify yourself as a switch, so that opens up many more possibilities for getting her to try something.

Keep in mind that trying something to start doesn't have to be whips and chains or even a simple spanking. How would she react if you simply captured her hands and held her arms above her head during sex, or wanted her to do the same to you.

Trying something mostly innocuous first and discovering she likes it could be a gateway to willingness to try more.

Just be prepared and accepting that, even if she starts trying things and liking them, her ultimate limits may not reach yours, so there may be some compromise necessary.