Let's not run away just yet; the police probably won't attack us while Volt is still active unless we try to help her. With the police to take shots at her and draw her attention, I wouldn't say we're out matched yet. It probably is going to come down to a fight if we remain firm on the whole 'no helping you escape if you're just going to short out more stuff' stance (which I vote we do).
Looking at her modifiers on those rolls, it's clear that her supercharging has boosted her physical abilities as well as her electrical powers. Basically, she's like Superman under a red sun; she's powerful, but she's been cut off from the source of her powers.
So;
1. When she was being shot earlier, her ability to take the hits dropped progressively the more she was shot. When she supercharged, her injuries healed and her ability to take hits jumped (look at that constitution modifier). Plus there's what I commented on earlier; her stored voltage focused on where she was hit. So she probably expends electricity to endure hits above a certain level of force and to heal any damage done
2. As I wondered earlier, if she was hit in several places in quick succession, would she expend more power to resist both hits equally, or would she take more damage from the second hit due her internal voltage being focused on the first?
Arg, can Mia do a perception check please? I want to know about our surroundings. Are there any lamp posts that could attract her electrical blasts if we were near them when she tried to shock us? Also, is there anything non conductive/magnetic that Mia could use as a club? Are there any covenient fire hydrants we could trick her into blasting/using her magnetic powers to open?
Basically, what I'm saying is that if it does come down to a fight, we need to batter her constantly to keep her off balance and force her to expend electricity. Assuming the police have the sense to not attack the meta siding with them at least until after Volt is subdued, then we might actually have the advantage. If she's being attacked from two sides, with the right timing, she'll get hit from behind every time she tries to attack one of us.
Obviously it might not come down to a fight, but if it does, it would be really be a let down to flee before it's clear we can't win.