This is just a thought. Seeing as some animals consider eye staring an act of territorial aggression, and even some humans, I think looking a SEE directly in the eyes would immediately bring her attention to you(in terms of interest that is).

Try not to be creepy-like but give her some guinuine looks now and then. Fixation might do some good but I guess that depends on age/maturity.

Also, at least attempt to look decent, even if they ignore Si.