Seriously, if that is NOT just her recovering from a cold, she needs to take a real break. Singing in a half-whisper like that is particularly hard on your vocal cords.
So... is she playing the lead girl? Noa, you guys were saying? I know nothing of Patlabor, except that it was featured in some anime magazines from my distant past... *goes to dig them up*
Yes, assuming they don't mutilate the story, the lead is Noa Izumi. And if that's the part ManoEri got — I'm not sure from that screenshot — that is HUGE.
(You're making me feel old. Patlabor was cutting edge during my own anime days.)