I'm betting that if/when you went back , and found more goodies, that :
When you show her the pile of stuff @ the tail-gate show (junk and everything), and if you had pulled a particular token or seated off-to-the-side and said "Here's one I don't have for my collection. Can I have this one ?", that she'd have said "yes".
People can/might often say such things (it's their property after all). But in actual human relations effect: I've never had anyone actually truly take everything.
And if I'm wrong, and you have that rare individual who is truly that stingy, then : Fine ! Take a picture of that seated or bust or LC or gold coin, and ... presto: That's 99% of our hobby anyhow, is the thrill of the hunt, the show & tell, etc.... Like a fisherman practicing catch & release: A lot of this hobby is "sport".
I would not thumb my nose at a good permission if it's gonna result in a good find, JUST because I can't keep it. I've got stuff on display in museums , or have given it to owners, and still enjoyed the "feather in my hat" so-to-speak.
tom! like the French say!..it's an "event physiological" it's all in your head!
(h.h.!)
j.t.