I'd say you won.
I would also do a higher quality render. Maybe think about getting a little more gold in the sun light, and add 1 high level cirrus cloud layer and play with the seed until it gets into those open blue areas a little more like the photo upper fore. Then print with a pro printer, museum glass, and a nice classic gallery frame (black). And put it on the wall where she has to look at it every time they are visiting.
Did she see the user gallery before she made the bet? I think you may have cheated a little if she did not see some good T2 examples first

... Playing on the naiveté of freshmen, Yossam? Or was this a case of children think they know best?

Ha ha. Oh well, Free food is free food... Don't let her off easy. Its a good lesson for a graphic designer.
And steak is not all that expensive. Get the noodles on the side.