It's hard for me to tell in the picture, but you may also have a bit of valgus in the knee, which I found out I had when I developed tendonitis. It's an inward collapsing of the knee (and foot) that's not uncommon in women apparently, because of the width of their hips vs. their knees, and especially heavier women. It's due to the outer hip muscles not being strong enough to compensate for the inner thigh muscles. (Abductors? I think it's the abductors and not the adductors.)
I got sent to a physical therapist who gave me lots of exercises to strengthen them. One is basically a variant on the clamshell, emphasizing using the muscles of the upper/outer butt and especially gluteus medius. (He said "back jeans pocket area" a lot.) If you do the clamshell make sure you are moving only your leg, not rotating with your pelvis. This guy has a couple videos on the clamshell which are long but good:
Clamshell exercise for cyclers dude
You can also do the "fire hydrant" where you raise your leg sideways like a dog, and push your leg outward with exercise band stretched between your ankles.
Another good one I learned from the PT involves slowly going up the stairs backwards, sitting far back on your butt each time before you take the next step. It's basically the beginning of a pistol squat, I figured out later. That's where I really noticed that my one knee tracks inwards noticeably compared to the other, so I started concentrating on pushing outwards and it's really improved. You could try that as a test. Over time makes your butt look really good too!