Make her crib comfy and cozy.
Crib mattresses are real hard... for me, I put padded the crib mattress by putting a blanket UNDER the fitted sheet, for my son. Then, both my kids liked having (baby safe) stuffed animals in their crib. We also had the Fisher Price "Ocean Wonders" crib toy on the crib, which they both liked and would operate it on their own.
AND, by 6 months old, my son had a lovey.... a stuffed toy that he just gravitated toward. So he slept with that too.
I breastfed my kids, exclusively. Both of them.
I sometimes co-slept with my kids... more often than not. But for naps and at night, they started off in the crib. If need be, then I just slept with them on a floor futon in our room, not in our bed.
Also, at this age, they get 'separation anxiety.' This is developmental. So they want you, look for you, wake and want to see you etc. But its normal.
Also they may be teething at this age.
Many things going on at the same time.
If/when you transition her to the crib... start with naps first.
But make any pre-nap/bedtime... a daily regular ROUTINE. The SAME routine everyday. A baby, will get used to a 'routine.'
After you nurse her.... well for me, I would not then just plunk my kids in the crib. I had a routine. First nurse. Then, carrying them, I would walk into the room and stand next to the crib, then I'd sing a song & rock them. I sang the SAME song each time. When I felt their body relax, I'd put them in the crib. Then I'd close the mini-blinds and turn on a fan on low for white-noise. Then I'd say good night. Then walk out the door and close the door behind me.
I did the SAME exact routine, in the SAME sequence, every day, every night. For example.
good luck,
Susan