Sleep Training

Anora started out a great sleeper, sleeping through the night until she was 1.5 mo old.  She then was up most of the night - not to beup, just because she wanted to be held.  We finally got her to sleep in her bed on her own, but she would wake several times.  We are now weaning her of the swaddle because she is 4 mo old and we are hitting sleep training hard core.  She has been FIO for several weeks now for naps and it definately worked right away, though she still only takes 45 min naps.  Well yesterday we decided to take away the swaddle and she cried for naps, but not long, and then just slept for 45 min.  Last night she went down at 7, up by 1030, then again at 1230 and at 230 and then the rest of the night.  After 230 when I knew she wasnt hungry, we let her cry.  She went between silence to fio, to cio and this went on until 6 when we were up for good.  She slept some in between, but not much, but she didnt cry the entire time either.  She went down for nap like normal at 830.  I fed her at 10.  She was tired at 11 so I went ahead and put her down because I knew she would cry a bit.  She did...but again, not long.  That was at 11.  Now I cant get her awake.  I woke her at 1 to feed her, she still tried to sleep.  I changed her, tickled her, all of that, and she still wanted to sleep. DD#1 is up now and she is waking her up and having success, lol, but I dont know what to do.  She keeps trying to go bacl to sleep.  I know she needs it and we arent successful at keeping her up, but I dont want her up all night. She is now out again...with no swaddle and no binky, which is what we want, but not now! Ahhh!  I dont want another sleepless night - we have had them for four months!

Any thoughts???  Do I still let her cry at night? Is she gonna be up all night because she wont wake up now?  Do I keep trying to wake her and stick to our schedule (every three hours, eat.wake.sleep, but only 45 min naps---usually). I am so confused!