I don't push epidural pt's until they've labored down to the lowest station they can. With a good epidural, the pt's not feeling much, so you can afford to let her body work, efficiently, hopefully without too much discomfort. Especially with a fetal cephalic OP lie. I would flip her back and forth, back and forth, back and forth.
(For pt's who don't have epidural, I even get them on hands and knees or standing on the bed, squatting, to try to get that baby to turn. Hopefully she's got an adequate pelvis to get that baby a-turnin'.)
Then, once her body's advanced the baby to the lowest possble station without her help, ONLY THEN will I start pushing with her. Otherwise, if you start pushing too early, you're risking maternal exhaustion (not to mention nurse exhaustion)
Sometimes you get the baby to turn, sometimes you don't. But it's a beautiful thing when you're putting gentle digital pressure on the posterior wall of the vagina and you see baby finally start to rotate!!!