Sorry you had such a mess to clean up. Maybe she chose the bathtub because it resembles a giant box? Her watery poop could be due to something she's eaten outside. I wouldn't worry too much unless it continues.
I'm familiar with the Denver skyline, my parents lived there for over 40 years. Your dad did a good job, Denver is one of those cities identifiable from it's skyline. There's no confusing it with any other place.