Question

read the excerpt from daughter of invention. ya, ya she waved them out of her room at last. there is no use trying to drink spilt milk, thats for sure. what does laura mean to express to her daughters? she wants her daughters to learn from her mistakes. she does not want to dwell on something that cannot be changed. she intends to invent many more useful things she can patent. she wishes that she had been the one to patent the suitcase with wheels.

Explanation:

The phrase "there is no use trying to drink spilt milk" is an idiom. It means that it is futile to focus on something that has already happened and cannot be undone. Laura is using this idiom to convey that dwelling on past events (in this context, likely related to an invention - related situation that didn't work out as she hoped) is a waste of time.

Answer:

She does not want to dwell on something that cannot be changed.