Darcy was tired: emotionally, physically, she'd been putting in more hours than she probably should have been in the lab since the message had come in. The worlds disappearing wasn't news but it was still a shock. Seeing Tony was a shock. She pushed the shock away and dove into the science, taking as many notes as she could.
She sent noted Cisco's exit, but didn't have the mental wherewithall to do anything about it at that moment. Darcy had a lot of questions, but it sounded very much like she and Cisco had been on the right track.
Not caring that Tony didn't like being handed things, at one point she handed him a tablet with their combine work for him to go over, quote "not tonight." There was a multiverse to save. A house that would need to be scanned, once they could talk and organize it with the owner, as well as Tony himself.