Marian in Ambergeldar

Amy ran into Marian when she took Mal -- er, Captain Sir Malcolm Reynolds -- back to Milliways after his visit.

And, after hearing about the goings on there, had invited Marian back for a short visit to Ambergeldar. (She would have invited Marian for an extended visit, especially as Marian cannot get back to her own world, but Marian has security duties, and Amy respects that. Still, even security members need breaks.)

After what happened with Mal, Amy gives Marian a letter of introduction, just in case she winds up in Loddingtop or some such place. And she takes the very simple and practical precaution of holding carefully and tightly to Marian's hand as they step out of the bar and into Amy's wardrobe.

"It's not, I fear, the most exciting first view of the kingdom. Do mind the shoes."

It's not the most convenient thing, having a doorway in your wardrobe. Things will get in the way of coming and going.

Once they're safely into Amy's dressing room, she lets go of Marian's hand. "Welcome to Ambergeldar."