If your stoker still can't get the seat low enough, you could also get her some shorter cranks. They'll be lighter where it matters (rotating weight) and she'll have to raise the seat height to accomodate them. In addition, if she is on the shorter side you both may find that she can spin better (i.e.-keep up with you) with the shorter cranks. DaVinci makes some shorter cranks and you can also get them from this link: http://www.bikesmithdesign.com/Short_Cranks/ I've bought cranks from him and he does a good job. Good luck!!