Answer:
The correct order of events is:
Margaret can't find valentine cards she likes in the store.
Margaret decides to make her own valentine cards.
Margaret researches valentine cards at the library.
Margaret makes a list of supplies she will need to make cards.
Margaret goes to the stationery store and buys construction paper, white paper doilies, wrapping paper, and colored markers.
Margaret makes valentine cards.
Margaret gives homemade valentine cards to her friends, and they love them.