I think pull-ups are always a bad idea, except at night/naps. We ran into the same issue last year - my son was just barely 2 and was potty trained about a month. We took a trip that involved a 4 hour plane ride and then a 2 hour car ride. We thought we better put him in a pull-up just in case. But whenever he told us he needed to go potty, we went right away! This included going on the side of the rode twice!! He ended up never once going in his pull-up all day.
We are all so ready to get our kids out of diapers, but the reality is that once they are in underwear, you gotta keep them in underwear ALL the time - no going back and forth. Which means life is VERY inconvenient and you have to be willing to find a place for them to potty asap. My brother had this problem with his kids - it always seemed safer to put them in a pull-up when they'd be in a car for a while... and none of his 4 kids were really fully trained until after 3! Too much back and forth, too confusing, too much allowing them to go in the pull-up because it's easier for the parent. My daughter could always hold it for a few minutes and never had an accident, but my son... if he said he needed to go, you had about 1 minute and 42 seconds to get him somewhere to pee!
I would stay home for 3 days straight if you can and keep her in undies or even naked. Also, if she is having a few accidents a day (even before this set back) she may not be ready. If you have to "catch her" and get her to the toilet, then she is not recognizing the signs that she needs to go - and then it's really you who are training yourself, not her. :) But my son trained at her age, so I'm not saying it's too early. You just need to be very, very consistent. We got to know just about every restroom, from Fry's to Home Depot, very well!
(in my opinion, I am never interested in limiting my kids' drinking. If they are thirsty, I want them to drink! We did get into the habit of taking them to the potty before we went to bed - they'd still be half asleep - but I wasn't willing to control/withhold liquids.)