.... she had me working on some pieces emphasizing the hands movement in order to have better control over the dynamics, but unfortunately this didn't have much effect on the issues I'm experiencing with my ring finger.
and whatever you do refrain from trying to force control.
Try to intentionally reproduce the symptoms. Strive for focus and awareness of what your body is doing, not just your fingers. Following that, reproduce passages of music that do not typically cause the symptoms, again being aware of what your body is doing. Compare the two results. Is there anything you are doing differently when the symptoms occur. Be observant of things that may not be immediately obvious.
Do everything that quantum suggests and whatever you do refrain from trying to force control.
First I noticed pieces emphasizing hand movements. Second, that the goal was the outcome (dynamics). We see this with some teachers, where pieces do the teaching - if you play these pieces, you'll get the desired skill by playing them. Often they seem to be traditional teachers, with a reputation (have good, advanced students, good interpretation of music). Pieces can have a particular thing: dynamics, or chords, or pedal, but you must also know how to do these things (physically), and working on a piece won't necessarily cause physical playing changes to happen.