She's glad that they seem to understand each other, that Megatron is listening to what she says and is taking it seriously. That he understands how much it means to her that he make things right with Wheeljack as best as he can. Wheeljack probably won't want to hear it, but he does serve an apology.

"Oh, I know," she says. "I mean, about Orion Pax, anyway. Optimus told us his original name when he showed us the matrix."

Which has not happened yet, but maybe she never should have said that.