I don't wanna steer you in the wrong direction, (as I am new also) but from the sounds of it, based on your situation you would need to plant that seed early on in the date for the close.
Get her to visualize that close beforehand through some playful banter and foreshadowing. Then when the time comes, your nerves will be able to revisit that scenario that has already been established more easily, rather than both standing at one of your doors and staring at eachother thinking "uhhh.. what now.." (I have been in that situation many times)
I know there are terms for these routines and tactics, but sorry, I am pretty new

and I have done so much reading in the last while it's all jumbled in my brain.
I try and remember......everybody poops.. even Elisha Cuthbert...This usually sets my mind at ease and makes it so I can still see every prospect as unique, yet ultimately the same.