A.S.
I think most kids go through a phase where they don't want to be in their room. We rocked our oldest to sleep from the day she was born, and until she was about 2 that wasn't a problem. however, by 2 she was finding reason to stay awake, i was pregnant again and being in her room for 45 minutes each night and naptime was unreasonable. We had to make a change. She was already in her big girl bed which made getting up easier for her. She usually didn't get up though, but she's scream and wail if I left her there alone.
I'm not a fan of the cry it out method (although I don't disapprove either if that's your choice) so I made a decision, 2 of them in fact. The first was that we ceased calling it "nap" time, the N word was enough to set her off, so I told her since she was such a big girl (we used that term a lot, enough that she actually thought her name was "Big Girl") she didn't need a nap anymore, she could have a quiet time!!!! I told her that only big girls had quiet times, and that she could have her favorite song playing (it's actually kids stories/songs on cd) chose 5 books - we went to the library for books that were only for quiet time, have her baby doll and rest for quiet time. If she fell asleep that was ok, and if not that was ok. She had to stay in there for a set amount of time, you can even set a kitchen timer, leave it in there and when you check on her if she's asleep remove it, if not then she'll know when to come out. The other kicker with our daughter was to leave her door open, I told her if she came out for something that wasn't an emergency then I'd have to close it, but if she stayed put then I would leave it open. It took a few days but that worked for 'nap' time. On the days she didn't nap she'd be tired, and sometimes even grumpy but by bedtime she'd fall asleep no problem.
As for bedtime, I had to work my way out. I started off by sitting beside her bed, then 3 days later closer to the door, 3 days at the door, 3 days, outside the door, 3 days down the hall, 3 days in our room and after that she was good. She'd cry a bit, but again the warning came, if you make a fuss and will wake up the baby then I'll have to go and I'll have to close your door. If you're hush quiet then you can leave it open.
Just remember no matter what you chose, whatever you try be consistant. make a plan and stick with it. I know how easy it is to give up, but give it 1 month. Whatever you choose, 1 month of a solid try. If it doesn't work then try something else. We set the patterns for our kids and sometimes we forget that the change in routine, can be a little traumatic, and hard to adjust!
Good luck! And let us know how it goes!