I thought she looked more tense than pissed. Tense and incredibly insecure of what was going to happen next. It was more like a "D... I don't need this right now" look than a "Go to hell jerk" look
I think they've might had some flirting in the past or maybe even a relationship and they are hooking up soon I think they are both very funny and highspirited people - and they are cute together*duks from Liz´ flying object*
I'm still a S/M shipper by heart though, nothings going to change that! So don't get your hopes up Kimberly!