read her the OW rules verbatim from the website
I do wonder why they don't express the rules more clearly and unambiguously (as I'm trying to do here). But maybe it's deliberate, so they have plausible deniability if they need it!
My guest did not leave with me (yes I know that's the rule)
Where do you see this rule? Are you too letting "invite [...] to join" do all the heavy lifting?