McKay? Daniel knew Rodney here? Sam's eyes widened at that, especially when he then brushed past her, obviously thinking that this was a joke.
"Daniel, no," she told him, reaching out to keep him from closing the door and stepping inside. "Please don't. This isn't a joke. Rod--McKay...he didn't put me up to this. I know how much he irritates you sometimes, but he didn't put me up to this."
She had to reach him somehow. She needed his help - especially if he knew this universe's Rodney McKay. Otherwise, she didn't know how she was going to get home.
"I know you're right because I've seen it," she told him. "This is going to sound crazy, but I'm from an alternate reality. One where your theories have been proven."
Reaching into her pocket, she pulled out the picture that she kept there of her, Daniel, Molly and CJ. She looked at it before giving it to him. "One where I'm your wife."