Are these the tickets your daughter won at an auction? You'll need to check the tickets to see if they can be upgraded since often tickets offered as prizes are complimentary and cannot be upgraded because they have $0.00 value.
If they can be upgraded it will have to be done at the ticket booth at DL. According to the ticketing rules you will only be able to use 1 ticket for each upgrade even though you have 4 tickets for 3 people.
If the tickets cannot be upgraded it will be harder because you will have to look at ticket prices and decide what will work best for you. A couple of possibilities: forego hopping and have 1 person use all the tickets, or everyone uses 1 ticket each on a non-hopping day and buy multiday tix to cover the rest of the days.