K.H.
A.,
Yup, I've been there. We had a similar thing. We tried putting our daughter in a toddler bed a year ago when she was 17 months old. Naps were great, bedtime was diminishing and with them our sanity. So we put her back in the crib for another year & just switched her to a toddler bed last week. She is 29 months now. It has been dreamy. Sure there are about 2-3 naps a week where she is playing in her room instead of resting, but developmentally she has been much more able to handle the transition. She loves her toddler bed & feels like such a big girl. I know a lot of people do the transition early on, but there is a lot of benefit to waiting until they are older. If you don't want to switch her back maybe getting to bed a bit earlier would be helpful. Sometimes going to bed late can be overstimulating for them because they are already past tired. Is she getting the 14 hours (naps included) she needs at this age? Maybe an earlier nighttime routine would help her not fight the sleep. But, then again, the freedom of a toddler bed is tough to compete with. Hope that helps.
If I may, I'd like to recommend my favourite sleep book out there. "Good night, sleep tight: The sleep lady's gentle guide to helping your child go to sleep, stay asleep & wake up happy" by Kim West. She is amazing & takes you through from birth to five. She was the one that said the longer you put them in the crib, the easier the transition. If you need more, there is lots more in there. It has been our one go to book on the shelf after trying out about half a dozen others.
Best of luck.
K.