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Here's my test -- if you look back and you wouldn't change what you did, then you aren't feeling guilt. (You could be feeling shame, but that implies that you wish you were the person who would change what you did but you aren't.) You may be wallowing in self-pity, but that's a different emotion, and I want my kids to learn the difference.
But besides my little hang-up, it was a bright, companionable book that we liked a lot. Our favorite page had the girls playing cards, the mom advocating cheating to let Emma win (P and I were shocked), and the clever but rejected solution of 52-pick up, which had P chortling. I got A and X to read it as well, since A is an actual big sister, and they also liked it (especially A). We ended up with a fun discussion about poetry -- all the kids were sure it was not a poetry book, but we agreed that a new word was needed for books that weren't poetry but had "picture book" language that felt a little richer than plain prose.