(Admittedly, Donna's backstory is not his fault, but Roy teaching an adult Amazon to fire a bow will never sit right with me.)
Leaving aside the fact that this Donna had never been a proper Amazon, since she was removed from Paradise Island aged about 10, A) it would be utterly arrogant, approaching the moronic, for any skilled warrior NOT to be prepared to take a refresher course (since I can't think of any time Donna has relied on a bow) and/or booster tips from someone who has a natural genius with a particular weapon which Roy definitely has.
It'd be like critiquing her for taking hand to hand combat tips from Dick, or quarterstaff sparring with Kory.