I can easily back Meat Puppet's theory up.
1. When Squall is just leaning against the wall, Rinoa comes and drags him to dance with her. This proves her force.
2. When Squall is going off because he doesn't want to dance, Rinoa pulls him back with her. This proves her stubborness.
3. When Squall makes it look like he can't dance, Rinoa "guides" his arms/legs to dance with her. This proves her Obsessive-Control-Freakiness.
4. When another couple is dancing, Rinoa yells at see the guy who accidentily crashed into her. This proves her anger.

When:
Rinoa+BC*(Forcefulness+Stubborness+Control Freakiness+Anger)-Little innocent girl Costume=Rinoa the Beast.

*=BC=Beast Characteristics.