Is the pattern paper pieced??? If so make sure you cut the pieces quite generously especially if you are new to paper piecing to give yourself plenty of wriggle room. (I use around 1/2 an inch or more all round)
I also would not cut all the pieces before you start. Just do 1 part to see how it all goes and see how much wriggle room you will need.
I love her patterns and would love to do one, good luck with yours