"iya, ya! " she waved them out of her room at last. "there is no use trying to drink spilt milk, that's for sure."

what does laura mean to express to her daughters?

a) she wants her daughters to learn from her mistakes.
b) she does not want to dwell on something that cannot be changed.
c) she intends to invent many more useful things she can patent.
d) she wishes that she had been the one to patent the suitcase with wheels.

The correct answer is b :)

An inference that can be made is that the princess is bothered about the tiger door. although there are reasons for both this one has a better reason. the princess is not a monster and even if she didn't want to marry this man she wouldn't want him to die. the grudge of death is pretty heavy. unless she has done this before and feels no regret then she wouldn't want to be married to someone of low quality, if he is low quality.