I haven't watched a lot of her match (was at Misha's match trying to support him), but her srving is good. It's not great, but she is a tall girl and definitely could develop it further.
It's a topspin serve, so not very fast but with a nice kick (sorta like Mauresmo). Second serve is visibly slower, but Regina mixes it a lot better than Alisa Kleybanova.
vaiva, she is one of those hard hitting girls. I think I know why you are asking. I do hope too that Regina works on her variey. But in her first round match, she completely overpowered her opponent.
btw, another thing I was impressed with is her returns. She goes on offensive right away. In that second set that I saw, her opponent could barely win a point (even on her own serve).
Vassilissa is my girl............