She understands the concept of multiplication as repeated addition. It's great that your daughter understands multiplication as repeated addition. Understanding math concepts before memorizing facts is important, so make sure that your daughter can explain what she's doing when she multiplies and can model multiplication facts with small objects such as pennies. She can use this conceptual model to help her master the times tables. For example, if she forgets 8 x 6, but knows 7 x 6, she can add another 6 to find the answer.
Flash cards are a tried and true way to memorize the multiplication tables.
Write each multiplication fact on a 3 by 5 inch card, with the problem on the front and the answer on the back. In addition to drill and practice, you and your daughter may want to make up some simple games to play with the cards. The computer is a good tool for mastering both quick recall of math facts and real understanding of math concepts. Davidson's Math Blaster 1 provides practice with math facts, including multiplication. The Knick Knack, Supertrader activity in Edmark's Mighty Math Calculating Crew helps children understand multiplication and division.