KING6024,
I greatly sympathise with your daughter's disappointment. For many of us who (nowadays) travel but rarely, the dictatorial attitude of some cabin crews can result in our missing a once-in-a-lifetime opportunity. Whatever happened to the wonderment of air travel?
Four years ago I was on a routine day flight from London to SFO, leaving about midday - a great opportunity to see the Greenland coast, etc.. Although many pax tend to doze intermittently on a long daytime flight, it's quite inappropriate to simulate night-time when the flight is due to arrive in the late afternoon. In fact, it's a recipe for jet-lag.
I tend to agree with Basil, but naturally one prefers not to be in a minority of one. The trouble is that most cabin window blinds slide open from the bottom upwards, so opening them a slit doesn't normally allow you to peep out. If they were in two sections, you would create a slit at a comfortable level, minimising the light ingress. (In my childhood, a/c usually had curtains! They were much more user-friendly.)