I've checked the forum and I couldn't find any reference to this...
why did Miller send a "Thumbs Up" signal when she reached her planet (the water planet) ?
If what Amelia Brand said about the time dilation is correct (1 minute = 7 Earth years) then Miller landed on the planet about one hour before Amelia and Coop's arrival. So why did Miller send a "Thumbs Up" signal without performing adequate analysis of her planet? Surely in that one hour she would have popped her head out of the hatch and noticed that she was on a water planet with huge tidal waves - and that it would be unable to provide an adequate environment for the human race?
Miller: "Oh, cool! Water, clouds, gravity's a bit high but manageable, picturesque mountains in the distance... it's humanity's lucky day! Too bad I can't plant a flag, though."
[ pushes thumbs up button, steps out the airlock ]
Miller: "Alright, time to break out the spectroscope... wait a sec. Where'd the mountains go?"