that aint no aggressive behaviour! lol she just wants to play and she obviously has energy to spare, even the walks she is getting is probably not enugh, walks are boring she wants to play, how is she off leash? to you ever take her to parks and let her off leash to play? if you cant how about teaching her to behave while bikeriding? you will be able to take her farther and faster, you can change your pace so she runs for a bit walks for a bit runs for a bit etc.. if you replaced your walks with something like this she will wear out better, or if you have a dog park, or just anypark that she can be off leash, bikeride her to the park, let her off, play with her, roughhouse with her whatever, then bikeride her somemore, until she is totally beat then ride very slowly home as a cool down for a muscles.