She was very much inclined to play some pranks when she was dressed up at such an unusual hour; to make her rich white silk balloon out into a cheese, to retreat backwards from her mother as if she were the queen; but when she found that these freaks of hers were regarded as interruptions to the serious business, and as such annoyed her mother, she became grave and sedate. 
When dressed up, she was inclined to play the fool; but finding that her pranks annoyed her mother, she became grave and sedate. 