Given everything that Sharon has been through the past year, in particular, and now that Adam is back stalking her, it makes perfect sense for her to get away from the madness for a while. I do not believe she wants Adam and she truly doesn't care about Skye - the man is a compulsive liar, among other things, and Sharon knows that. Nick is still crazed about the Adam-Sharon thing, so I don't blame Sharon for wanting to get away. I don't think it's a game at all. She wants some peace for a change, and she couldn't even get that in church! 8)
Sharon Case, rest assured, is NOT the rumoured Emmy winner being let go in the next few months. As MM said, SC has got a job for life on Y&R! :) The woman been's front-burner for like 4 year, especially last year, so probably if Sharon does "leave" for a while, it's because Sharon Case needs a well deserved vacation.