>>7
Oh fine

Maintain your distance for a little while to let her get over the break up. Some girls recover quickly others do not. Don't alienate or ignore her, just say 'hi' in the hallways or make small talk about stupid things, like acquaintances. Having someone interested in her that quickly looks a little stalker-ish. Look at her reactions toward you, if she flirts, then she maybe over her old bf, but don't read too much into things. Try not to bring up the break up unless she starts talking about it (I don't know why she'd talk about her personal problems with someone who seems to be a complete stranger, but it does happen) Try and get to know her friends, it's a lot easier for someone closer to the person to know when their ready to move on. If your not that close to her, then get to know her, but not too close or you'll be put into the rebound or friend zone, both of which are hard to get out off.

tl;dr Get to know her first before you try and decide if she's over her ex