You should have ask her how many cups of piss did she smell that day?
After all ya live on a farm ya don't smell the cow shit do you?
So if she was to smell every sample of course after while ya won't smell it.
Sorry but I would have said something right away.

What kind of weirdo are you smelling my piss?
And I would have ask to speak with her supervisor.
And on the papers should be the testers name.This is XXXXXXXX out tho but the time you were there and date is on it also.So they know who it was at the testing site.
You should have a copy and in your case two copys.
I would still talk to her supervisor.
That is over stepping her bounds by far.
She is a collector not a lab tec.