Answer :
2. She was pleased by the girl's enthusiasm
While telling Da-duh about New York the narrator showed her that she could dance by dancing the truck - a dance popular in the thirties. After this she showed her that she could sing by singing 'I’m Gonna Sit Right Down and Write Myself a Letter', 'Tea for Two' and some other songs. Da-duh was somehow pleased with girl's enthusiasm and gave her a penny to go buy herself a sweet from the sweet shop up the road.