Re: Reactions - Kellie's Natasha: She has been staying up-to-date with things that are going on with the Portal and Tony's plan. Even if she hasn't been physically present, offices have great connections to certain areas. Rest assured, Natasha's been watching. She has been keeping very quiet about the whole thing, though. She maintains that it is a terrible idea, but arguing with Tony can be like fighting with a brick wall. Don't worry. She knows she's just as bad.
So, as the testing began, Natasha had been watching intently from her office. Door locked. Curtains drawn (not literally, but you get the idea) and basically in "Do not bother me unless someone is dying" mode.
She took some notes with what she could hear through the camera feed and the second Tony did not come back through? Natasha was out of her office heading toward the lab. Avengers, Assemble!
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Christine: She's already going to be concerned given Stephen's network post regarding people being present and accounted for. She'll be happy to help behind the scenes with emotional support and, of course, medical assistance should it come to that. Hopefully, it won't.