UPDATE
It's been over 2 weeks now since she has bitten anyone at daycare. (despite
receiving a bite that left a mark for a WEEK!!) If she bit that day, she did not get the sucker that everyone gets when their parents pick them up. I think that made the biggest impression

. She has only bitten me a couple of times lately, both right before bedtime, wherupon we immediately stopped what we were doing, got her PJ's on and went to bed. Ultimately I think we kept this to a stage rather than turning into a 'behavior problem'. Thanks for the advice, I hope it's later rather than sooner before I'm asking for more!