I think that if she wants to do it, it's a great plan. I've been using WWE 1 and FLL 1 with my older son (will be 6 in January) and he hasn't had a problem. He's also a much better reader than writer, but he had already completed Handwriting Without Tears 1 when we started WWE. My younger son (5 in December) is ready for WWE and FLL, but has no interest, so I'm holding off until next fall.
WWE does have a lot of copywork, which might be enough handwriting for some kids, but we've kept up with HWT 2 days per week. The lessons for WWE and FLL are very, very short. Some days, FLL is closer to 5 minutes, but 10-15 for each is about right.