It is called: a chamber pot.
They've been around for centuries, but fell out of use when most humans started becoming really, really stupid.
I think most humans have always been stupid.
And you expect she will just hop right down to the local convience store and get one? How about the sink girl; you do have a sink don't ya?
Use the back yard stupid.
My fault. I have underestimated the ubiquitous extent of rampant obtuseness here.
Just about any container would work - a plastic tub, a large, empty jar; a bucket - if you understand what a bucket is, for crissake. Put a little water in it to make it easier to clean out.... It would probably be better if you don't use the sink, with your lack of understanding of hygiene.
This is starting to get a little creepy.
Why did you say, "with your lack of understanding of hygiene?" Was the girl just supposed to not pee anymore?
Even a person of very low intelligence would know that not everyone has a back yard.