Yeah, I took for granted her nosy nose would have known about the public stuff and what happened with Oliver Queen, and she'd probably get someone at The Daily Planet to dig up whatever was diggable on Harper, but as you say, probably not much.
Cat's really not a romantic character. She'd be up for a one night stand (because Clark is so unresponsive). I don't know that there would be any super villainry at The Blue Room, but the locak 'Big Bad' Lex Luthor has been out of town for awhile, so it would stand to reason that in his absence some baddies who would normally defer to him are coming out of the woodwork. Are there any that you'd like to play with, or shall we make one up?