If you're interested, I'd say go for it. From what you wrote, it seems like she's interested in you as well.

In terms of risk, I'm assuming you mean "if we break up does it ruin the friendship", and the answer to that depends on you guys. Providing nothing nasty happens and both of you are mature, it's more than possible to continue as friends (speaking from experience). Although it will be a little awkward for a bit, but that's where the maturity part comes in.