Quidditch wasn't really Amy's bag, sure it was okay but she wasn't that interested in it and there were millions of other things that the Westwood girl would rather be doing, other than watching some dull, boring and pointless quidditch match. However, this was different. It was her little brother's first game in quidditch, his debut in the Ravenclaw team. So Amy felt that she had to cheer on her younger brother, it was her duty as a sister. Especially since Donald loved quidditch, she knew that if she didn't show up to support him it would break his heart and she couldn't do that to him, not at all.
The Ravenclaw girl also knew that Don needed all the support he could get, while he was originally an alternative he had been selected, for this one game, as a beater. Although Amy didn't really follow quidditch, she knew a bit about it and she knew a lot about her brother, including that he didn't think the position of beater was a particularly strong role for him. She knew why as well, her brother was very skinny and a bit of a weakling if she was honest. Still she knew that he would enjoy every minute on the quidditch pitch and she had to be there to cheer him on regardless.
Amy gave an almighty cheer was the Ravenclaw players came onto the pitch and took to the air, "COME ON DONALD" she howled as they took off. To her credit, even thought she wasn't fond of the sport, she was giving it all her worth in supporting her brother, including making a sign which read, in flashing colours; "DONALD ROCKS". She wasn't that creative with signs, but she knew her brother would appreciate it all the same.
She seen her brother take another swing at the ball (a bludger was it?) and screamed again"GO ON DON, KNOCK 'EM GRYFFINDORS OFF THEIR BROOMS" for someone who wasn't keen on quidditch, she was funding herself really starting to get into it.