I'd say the illness is almost cleared, by day 7 of antibiotics she's likely alright. You can give meds for teething pain before sleeps....and OT can't be combated if she's refusing that second nap. Then her A to bed is probably too long, even if you're doing an earlier bedtime. So, I'd do pain meds. about 30 mins. prior to sleep. Try to shorten that first nap and work on finding a good A time so she'll settle for a good afternoon nap. Then get her back to her normal bedtime. If she still refuses....do you think she'd take her morning nap even earlier than usual b/c of the EW? Maybe if it is earlier and still the normal 45 mins. she'd take the pm nap??? I just think with all that is going on, she needs a good day or two of good naps to help get her back on track.
Can you APOP a second nap? In the car/stroller? Then maybe you could continue letting her sleep as long as she will in the morning and try to APOP a catnap so you can get to bedtime with a less OT LO. Then maybe the EW will drop.
OH and also consider some dream meds. (maybe near 3 or 4am or so) if teething is really bothering her. That might get her over the EW hump as well b/c discomfort won't wake her.