"My type is very ritualistic," she said. "It involves the collection of specific items, and...basically the imbuing of my will into them. It's quite time consuming, and a good deal of it needs to be done in advance."
As she'd gotten better and more confident, less and less of it had to be done in advance, but there was still an awful lot she needed to do beforehand. To be honest, she was slightly jealous of those who could do things so instantly with a wand.