Hi Lil' Lori's Mom!
Welcome to cruise-chat.
Sounds like you cruise a lot; it's nice to have you with us--especially since Princess is your favorite line, as it is mine.
I did the same cruise last March on Diamond Princess' identical twin, Sapphire Princess.
If you cruise Princess you have probably sailed on one of the Grand Class ships or Caribbean Class ships (not sure if that's a separate class but it should be because they are bigger); the only things Diamond and Sapprire don't have are the Movies Under the Stars and The Sanctuary--neither of which appeal to me, but maybe they do to you.
What they do have is more room; they are bigger but hold fewer passengers (except Grand Class, and then only 70 more); not that I ever felt cramped on the other ships--far from it--but Diamond and Sapphire are even roomier.
Other than that, the staterooms, dining rooms, lounges are all pretty much the same. I love them all.
If there is anything specific I can answer for you, please ask.
Once again, welcome; you have a wonderful daughter. To express your love for your mother in a public forum is very special.