Hey, their AC is super high... FOR A ZOMBIE. These are Zoombies. Unlike regular Zombies, who are clumsy slow-pokes (AC 8!), these have normal movement rates, and AC10. I like to describe it as they're really fast, but they don't ever really bother to defend themselves.
Ooof, those perception and investigation checks were... not good.
[MENTION=6899077]EarlyBird[/MENTION]: I think a survival check to look for tracks would help... wait is this how it works in 5e?
If Miss Imogen doesn't need to rest, she could take the girl to the healer and come back in the hour so we could go to the ziggurat right after the short rest. Just a thought.