I believe that Tanya is suffering some sort of PTSD, and the military personal asking for the tower group to come with them for physicals activated a bad memory for her. We don't know much about what happened between the day of the event and when she was introduced. Anything could've happened to her before the colony, at the colony, etc. So something very minor could bring back a flood of bad memories, like in the case of any person who went through a traumatic event.
I am going to back away from the idea that she is infected, because she has been around too long since the Randy incident to have not turned, but I can see the side of the argument where Saul is immune to the virus, maybe his Mother is as well.
On a different note, I have a feeling Victor (Vickie) is done for, just a theory/fear that Victors oxygen tank/equipment is not attached right.
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