Put away sewing needles and string.

If I were you, I'd try to make it obvious that Samantha is as well taken care of as humanly possible. Make sure she sees a clean water dish and food bowl, toys, etc. Make sure she's wearing a collar w/tags and that the lady notices it. I'd try to show off what a responsible pet owner you already are, you know what I mean?

A room where you could isolate the kitties for their first few days, until they get used to their new surroundings, would be ideal to show the lady.

Man, this is one tough adoption!! They don't mess around, do they? Good luck! If the lady has half a brain, she'll recognize that these kittiens will be in the best hands possible with you!