Jealousy?

Lu Wuqi didn't care if this bunch of ungrateful bastards died by the zombies or not but she at least had to keep her own conscience and principals clear.

She had previously promised them to get them out of the hospital safely and then go their separate ways. Now that more zombies have come over, she will clear them out first and go away from these parasites as soon as possible.

Thinking of this, she didn't want to waste any more time and immediately focused her attention on killing this hoard of zombies.