rh, maybe she's afraid you'll do a drug test. (G)
I suppose a bedpan would really traumatize her. Do you have a "real" seat on your bucket, or just a real bucket? Maybe something with a seat would pacify her? They do make snap-on lids for plain buckets, that have a real seat. Not very expensive, adds a little civilization.
Or you can line
it with a plastic bag, throw in a handful of kitty litter (half to what you think you'll need) and absorb the pee. Then just pick it up and throw it out ashore, no washing needing, no pee to splash around.
Maybe if you just promise her that you won't do the drug test. (G)