Wasn't this from the relevant thread you made earlier? Could have just asked there.
OT: That doesn't look like a good indicator. Bluntly put, if she actually liked you then she would have given you a straightforward answer. Her wanting to have two days to think about it, comes off as though she's afraid of rejecting you and thus hurting your feelings.
My advise? Think nothing of it. Give it the don't care mentality, and if she decides to say no then brush it off, as it's her loss. Also this thing you're doing here, what with you making these threads about this one girl, is unhealthy. I'm sure you like her, but don't work yourself up over here since you're limiting yourself to this one person.