OK, full disclosure: I saw this book in a store window and I bought it because my daughter's name is Nancy. My wife was against the book because she didn't want to encourage our girl to be too "fancy." Turns out, she needn't have worried. This isn't really a book about being fancy. It's a book about being yourself and your family accepting who you are, if all that fits in a book for pre-school kids.
Yes, Nancy likes things fancy. (She has clever lines like "Then I get an idea that is stupendous. That's a fancy word for great." and "Lace-trimmed socks do help me to play soccer better.") She's disappointed the others in her family aren't as fancy as she. So she offers "fancy" lessons to her family and they all attend. Then they go out for a "fancy" dinner to a local diner. It's all very sweet, actually.
And it's worth mentioning that the illustrations by Robin Preiss Glasser are beautiful. (I'd say "fancy," but that doesn't seem to strike the write note concerning these gorgeous pictures.) All in all, this is a book about a loving family that should be shared in loving families.