Chapter 1a: Meanwhile, at the hospital... (Lena)
Excellent.
"Ich bin Ihnen sehr dankbar!" She left the rest off, playing up her exasperation.
Lena had a plan. She would, in fact, get them to help the nurses triage the patients. That part would be obvious.
But as soon as there was an opening, she would make an excuse to vanish a moment, come back to the artillery, and steal small parts, things that looked important but could feasibly be lost by mundane error. Bolts, hinges, any small part that would impede the assembly and preparation of the artillery. She couldn't stop them from installing it eventually, but she could make this position non-functional for several hours at least (if not longer) given how disorganized everything was.
The thought occurred to Lena she had finally crossed from spy to saboteur. The walls were closing in.