When does De Santis go to the lab?

I want to finish challenge to gas her in the lab, but she just hangs around on 6th floor.
When does she head for the lab? What needs to happen?
(I saw her once go there, but at the time I was playing romantic challenge dressed up as golf coach, so I missed it)

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You have to destroy the virus first, after you do it one of the hazmat scientists will call her and tell her to go to the lab. She will then make her way there along with her bodyguards.

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Destroy virus before you kill her. She will then go to the quarantine.