Actually, I think option 1 would work, but I don't see Ino thinking anything of it except finding it odd that Shikamaru approached Sakura for anything in the first place considering they never, ever talked until the Sand attacked the Leaf. It starts innocent enough. Ino's a teasing girl but I don't think she'd just jump into the whole "Over Sasuke already, I see." and suggest that Shikamaru was anything other than cordial with her. The point is for Ino to see Shikamaru as someone worth being with, but I don't think she sees him as more than a good friend at the moment.