They wouldn't let her in without a VERY good reason, but with such a reason an audience with the UCS isn't necessarily out of the question (assuming you could get him at a time when he's not playing the Games).  In all honesty, if you want to meet him, your best bet is to go to Yu-Shan during the Carnival of Meeting.  He's definitely out of the Games during that time, and violence is forbidden in the Carnival grounds.<br/><br/>I don't think she'd be at big risk of being killed by him outright, though.  His super-high Temperance and Compassion would argue against that, and if she presented no direct challenge Valor would work against attacking an "unworthy" foe like her, anyway.