Help re DD's Knee/Feet!

Two years ago my dd tore her meniscus and pinched her fat pad, left knee, while lunging in fencing (this was her supporting leg). First doc poo poo'd Rx'd
PT to no result except more pain, increasing sedentary lifestyle for dd. I had strenuously asked for an MRI at time of injury, BTW

Took her to the "knee God" who ordered the MRI, performed arthroscopy and declared knee "perfect." Still more recovery time. Good improvement.

Now dd is having knee, ankle and foot pain. I'm really concerned. She has flat feet - so I'm taking her to a podiatrist. Also to new ortho surgeon (we've moved) re: knee. She says she CANNOT keep up in gym due especially to foot and ankle pain -- and yes, she wears good shoes (small miracle). She tried to go out for fencing at new school and said "no way" too painful.

Our ins. provides for "musculoskeletal" specialists and chiropractic -- I'm kind of loathe to get involved w/ the latter because dd will thrive on the constant appointments.. she's a bit of a hypochondriac but I believe the knee, foot and ankle pain are real and disabling. Am I on the right path re:
providers?

Should I be worried about arthritis, Lyme, etc? Many thanks!