Rene’s support of allowing the new Green Arrow to enact his (or her?) own brand of justice put him at odds with Dinah, and he wound up behind bars because of it.
She did release him, but that doesn’t mean she’s 100% on board with the new Green Arrow’s activities… for now, at least.
Diggle has understood Dinah’s devotion to her new role, as he too has dedicated himself to fighting the good fight in a way that doesn’t involve illegal vigilantism.