Sing to her. We sing the teeth-cleaning song to DS1 (clean your teeth, clean your teeth, it's time for you to clean your teeth, count to ten and back again, it's time for you to clean your teeth, one, two, three, four, five, six, seven, eight, nine, ten, nine, eight, seven, six, five, four, three, two, one!)
He's a bit older now though - just over two - and he did put up a struggle at about 17mo, iirc - just keep doing it. And good luck!