It's fine to take her to bed with you. Do not feel guilty about that. Kids need some night-time parenting! You could even side-car the crib to your bed to give her her own sleeping space then you don't have to get up at night to go get her. It's just a little suggestion and you might want to google side-carring to make sure you get some tips on how to do it right.
Around 24 months my son started to not fall asleep like clockwork either. Bedtime was a battle with him standing up in the crib not wanting to sleep. Since he usually does sleep when he's tired I took it as a cue that maybe he's just not tired at that time. So for a few weeks he found his own schedule. When he napped I let him go as long as he needed. At night I waited until he showed signs of being tired (rubbing eyes, squirming as we read books) until I went in to lay down with him. If he still protested, but I was really certain at this point that he was tired then I would just be firm. Usually he would accept sleep. He's 27 months now and falling asleep at 9pm, waking around 7am, and napping from 1-2:30/3:00.
We also went through a phase of 45 minute naps just recently. I thought he was dropping his nap, but it passed in about 2-3 weeks. I found find that if he slept for 12 hours overnight he seemed to not be able to take a long nap the next day. So even if he had a short nap I stuck to the same bedtime or maybe only slightly earlier. Then he was tired enough the next day to take a longer nap.
Teething...could she have molars coming in that might make settling down difficult? Sometimes the pain isn't really noticable to the child until she's calm and just laying there. Maybe a little medicine before bed would help.
I don't know if that's helpful, but I tried! Take care and good luck!