I think until the teething settles down, you just have to work with each day as it comes, as harrowing as that sounds. It's impossible to judge which nights she slept 'better' therefore feels more rested, regardless of length of night, if something is bothering you and you have a restless night even though you were in bed for 10 hrs you may still be tired IYSWIM.
If she didn't have a long nap, I would say that 10-10.5 hrs is probably OT and you should still get her up and proceed with your day, earlier nap if you can and see if she gives you a long one. If not then you plod along until bedtime, make it earlier and let her tack on to her night. Then start said process again the following day lol
We once had regularity. I think it was a Tuesday.
Oh and it's mandatory to be frustrated with teething and sleep lol