I think that she could have pushed me a bit harder, given how effective the Oxycodone is at managing my pain,
Contrary to poplar belief, it’s not a good idea to depend on pain medication to get you through PT. Pain medication will mask the pain, and that will encourage you to try to do more than is in your healing knee’s best interest. Pushing your knee to bend more than it wants to, especially in the early weeks, will only aggravate it and cause more swelling and inflammation, which will reduce your ROM, after that initial “gain” you pushed for.
Also, contrary to popular belief, it is not necessary to push for more in this recovery. Your knee and whole leg have been through the major trauma of this surgery. It honestly needs gentle treatment, so that trauma can heal. As you heal and get your swelling down, your bend will improve, by itself.