"is my daughter smart" and "is my daughter pretty" both show up as 0 in google trends (as I search today). What does "daughter pretty" include? I would predict massive public interest in questions of the form "is Reese Witherspoon's daughter pretty?"
Yeah, they don't show up with a zero, it just says not enough data to show so hard to draw any conclusions. I agree this is an imperfect proxy and it's not definitive but I'd still absolutely take you up on that bet (conditioned on there being some way of actually resolving it).
But maybe the real question is, why aren't people asking "Is Reese Witherspoon's daughter smart?"
In specific, obviously because Reese Witherspoon is known for being pretty. I'd also bet that "Is Bill Gates's daughter smart?" is a more popular search than "Is Reese Witherspoon's daughter smart?"