If she liked you before, her feelings might return once she's you're interested in her again. I think surprising her with a kiss might be a bit too much though, especially when you're unsure of how things stand. I'd suggest at least flirting with her beforehand. That could warm her up for this kiss, and based on her reaction to the flirting, it will give you a sense of whether it's safe to proceed with kissing her.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy