An essence loss of >5 may mean -6 on her current and maximum Resonance, but if she submerged before the final point, her maximum Resonance would be 6+1-6 = 1, and her maximum Submersion rating equals her current Resonance so 1. In other words, if she submerged and raised her Resonance before hitting 0, she'd be fine but stuck at 1 forever.