I'm not an expert, but usually when you get vibration during braking your rotors are warped. If the wheel is vibrating at non-braking, higher speeds, then it's usually wheel balancing. But in your case, it does sound like warped rotors.
How many miles does she have? Have you replaced the OEM pads with dust-free ones? Any more info would be helpful.
PS - I avoid using the parking brake as much as possibly, only when it's necessary, i.e. inclines etc.. If you're prone to using the parking brake (unnecessarily) every time you park, especially after the rotors have heated up quite a bit from heavy braking, then hot rotors will cool around the clamped pads, which in turn leads to early brake rotor warpage. And another cause for early rotor warpage is prolonged resting periods (for weeks outside with fluctuating temps) and the parking brake is applied unnecessarily. Just a tip, hope this might help in the future.