I know exactly what you are going though! PLEASE do not try anything other than breastmilk or formula. You are doing just fine, don't believe what other people will say about cereal in the milk/bottle! It scares me to think people listen to that old theory. Your child needs nothing except you or formula for 6 months!! Not a day earlier, don't believe theories of food at 4 months either, no need, just increases the risk of food allergies! Anyway, to help you with your sleep problem....yes SOME children will sleep in longer intervals at about 10-12 weeks, but some don't. She loves her mommy and wants to be close. BUT I would HIGHLY recommend you check out or buy the book The No Cry Sleep Solution by Elizabeth Pantley. LOVED the book and it helped us out sooo much with our first! Also, get into a good routine/pattern with her. Bath, lotion, books, songs, nurse, bed...whatever works for you, but keep it consistent. Starting at 8 weeks, you can start with a more consistent routine and slowly but surely, she'll figure things out. You have to "train" and i use that word loosely, but help her learn how to fall asleep on her own and stay asleep! Nap when she naps during the day, a lot of babies get their days and nights mixed up, but it will all work out in the end.
She is so little right now, and very precious, enjoy these small and tender moments, they grow up to fast!! Good for you to transition her to her crib, I held on for a little longer than you, and everyone is different, and there will be times when she needs you more and co-sleeping or co-napping are great for that!
Good luck, let me know if you have any other problems/questions!
I love how you are typing with one hand! I've done that plenty! Now, my secret with my older one is to find fun cartoon videos and songs on you tube and my 2 year old will sit on my lap and enjoy some videos while mommy types emails!