I, along with every parent here, could probably tell you that our babies have slept better in bed with us, or in their car seats. Many parents co-sleep, but there are dangers (rolling over on your baby, baby getting smothered in blankets, pillows, a soft mattress, etc...), so I'd encourage you to look into a co-sleeper that attaches to the side of your bed.
I need to encourage you (and other moms) NOT TO LET YOUR BABY SLEEP IN THEIR CAR SEAT!!! Naps, while they are being closely watched by you, should be fine, but NEVER let your baby sleep in a car seat! I was distressed to hear this, especially from one poster who suggested putting the car seat in the crib! DO NOT DO THIS! It usually says on the car seat itself, or in the manual, that children should not be left unattended in their car seats! So many things can happen (the car seat can roll forward, especially on soft surfaces like beds, the buckles may not be fastened and they can strangle).
Our cousin's baby was killed at their day care, and this is why I am urging you not to let your beautiful baby sleep in the car seat! At 11 months old, the day care provider was letting their little son take naps in his car seat because she was watching two kids and only had one crib for nap time. The provider thought she had securely fastened the 5-point harness, but unfortunately did not click in one side of the bottom belt...their son slid down during his nap and was strangled to death by the chest clip at his throat. The coroner said that when he slid down, it immediately put pressure on his throat, so he was unable to cry to alert the sitter that something was wrong. It was the worst day of our cousins lives. Please, please do not let your baby sleep in their car seat!!!
I know that hearing her cry is a horrible feeling, but she will grow accustomed to her old schedule in a week or two, and will be totally worth it. The best of luck to you.
M.