in 4 weeks she will be 13 weeks old? hmmm..
at some point babies automatically switch their schedules. my son was doing most of his sleeping 1 or 2 until 5 or 6. .. we could then cosleep and get him to sleep until 7 or 8.
crying it out will NEVER work, even though it seems to make baby stop crying, it isnt out of any 'learning to go to sleep' on the baby's part. it is more about 'ok mom and dad dont listen to me or respond to me so why bother crying?'
so AWESOME for listening to your instincts on that! :D
just go about your normal routine. always feed baby when shes hungry, always respond to her cries. you may NEVER get 8 hrs of sleep, or it may be a few years before you do. the things we did with our son seem to have worked so perfectly, i wouldnt trade it for the world, and the child i have now, with his awesome sleep habits.... i really recommend to everyone to try cosleeping. if it doesnt work it doesnt work, hoewver, if it gets baby to sleep, you can always move her into her own bed when shes asleep... what makes this easier is if her bed is in your room.
babies are NOT conditioned to sleep. mostly as protection - they will not sleep long hours at a time - be glad of this as frequent waking prevents SIDS. also, their tummies are tiny, and empty quickly, however a full feeding might keep her awake for a little bit because digestion is disrupting, however, if you are nursing, the stuff in breastmilk helps babies sleep... anyway...
around 12 weeks old she should start waking up more often during the day, and will POP into a better sleep routine. start the bath (not every night), reading a book, do a prayer if you wish, sing lullabyes, and do your thing. one thing that also helped our son is white noise white noise white noise. :P
we got a cd, 'for crying out loud' - i got it online... its fantastic. it has 8 tracks of different white noises on it, you can use the one that your baby prefers. our son wanted the vacuum cleaner - we ran our real vacuum for 2 months before we found the cd! now we run it every night and it really helps us all sleep because it blocks out the other sounds that dont matter :P my husband is a VERY light sleeper and every noise wakes him up...
anyway... another thing that will help is a night light....
or classical music....
anyway, i hope something ive suggested helps...
otherwise, try checking out www.askdrsears.com....
and trust yourself. youve got the instincts for your baby, not me ! :D good luck!