If I understand correctly, this lady who arrived alone requested for total privacy?
I suspect prostitution.
Bottle of urine: What type of bottle are we talking about? 16oz cola? party size bottle? 1gallon milk jug? I am asking because I dont think women could urinate successfully into a bottle.
Request for privacy: Any clue if she had male visitors during stay? Did you find any lubricant stains on your beddings? Towels that doesnt belong to you? Left over oil based body lotions?
Bloody bed sheet: Ive seen this when my guest was high on drug he sniffed using straws. He often had nose bleed and pillow case was all bloody.
Where did she come from? If she is a local then most likely she is an escort.
Did she arrive by her own car? lives within the same State or Province?
Her inquiries: Did she ever ask about private entrance, parking, buzzer, phone?