Well, Rhea's gonna be useless in this battle...  unless, you guys allow her to unconsciously and temporarily unlock her cellular disintegration abilities...  Uhmm, like, someone splashes blood on her and she loses her bolts, causing the unconscious restrain she placed upon herself to vanish and, for the mean time, go haywire with the disintegration since she's now acting on instincts to survive, not to heal others.  

That's just a suggestion, though.  I'll try to think of better ways for Rhea to assist against life-sucking zombies.