Ok, I hope I don't make you mad by saying this, but Doctors have knowledge of doctoring---NOT putting babies to sleep. I have 3 boys, 13, 9 and 7 mos. I never let any of them cry themselves to sleep. Child psychologists will tell you that a child who is tended to when they need you will actually grow up to be a very independent and secure person. In my opinion and experience, Dr's only have experience with many issues with babies, outside of health issues, if they have their own kids---in which case they are just a parent giving their opinion. I worked in an office with 40+ docs, 9 of which were pediatricians, and trust me, they are good at doctoring, because they have studied that, but they ALL have very differing opinions on how they parent their own children and how they advise their patient's parents. Many pediatricians will also tell you that teething doesn't have anything to do with your child's illnesses that seem to ALWAYS coincide with eachother, after 3 kids I definately do not agree :o) My baby is cutting one right now and bam here is the green snotty nose and etc.
Kids go through sleep disturbances, they push the buttons, they love their mommy and daddy and of course want them around as much as humanly possible. So, they come to the door and call for you, they need 20 drinks of water, they are scared, cold, hot, have a tummy ache, whatever they can think of to get you to come back to them one more time :o) If the blanket helps you get her to sleep and keep your sanity, then I would leave it in there. She will give it up eventually.
Kids go through stages, they will get rid of their pacifiers, they will bottle break, they will eventually get rid of their blankie or stuffed animal they can't live without, they will not be 15 walking around with blankies, trust me! Do what works for you all as a family, don't worry about what your Dr or anyone else tells you. You will meet a ton of parents on here who have slept with their children in bed with them, or that put their babies on their tummy to sleep as soon as they were rolling over. Even though this Dr, or that study tells you otherwise. SHe is your child, do what your mommy instincts tell you to do!!
Good Luck!! Parenting is a ongoing expedition, you learn as you go, and we are all different, you have to do what works for you. Take Care!