Hi N.,
I have a 12 month old daughter who has had episodes of not wanting to sleep in her crib. We moved her to her crib (from a bedside bassinet) at about 4 months of age and she has been there ever since. But whenever her sleep routine was interrupted (like from travel, etc) it would take us a couple of nights to get back into it.
I can not let her cry it out so what we do is follow our bedtime routine ending with laying her down in her crib. If she starts crying or stands up in her crib, we walk in and lay her back down, stroke her hair once or twice and then leave the room. If it continues more than 5-6 times, then we just go in and lay her down. We never say anything to her and we never smile. We respond to her cries by going into the room but in our actions we try to be clear that it is now sleepy time.
It will probably be harder on your daughter since she has gotten used to sleeping with you, but it will work as long as you don't give in. I recommend starting on a Friday night so that hopefully by Sunday night she will have caught on and sleeping through the night.
If the teething is really driving her crazy and is hurting her so much she can't sleep, try giving a half dose of Tylenol. That should be enough to take the edge off and allow her to sleep for a few hours straight.
I think (although I don't remember for sure) that at 6 months she can sleep through the night without nursing. When we decided my daughter was old enough to sleep through the night without a snack we just changed her diaper (like we usually did when she woke for her mid-night snack) and then put her back to bed and she fell right back to sleep. By the third night she no longer woke up to eat.
Good luck! It will be hard to get her to sleep in the crib but the sooner the better!