It occurs to me:
Even if standard protocol is to kill infected people immediately: they can't.
If she's still going to be Tuuri for a few days, they desperately need her to, while she still can, help with repairing the cattank and try to transmit as much mechanic's knowledge and language translation as she possibly can, before (barring their finding a cure, which I very much hope will be the way out of this) she becomes incapacitated.
(I had an additional thought on this; but I posted it in the Character Development: Tuuri thread.)