Look for any obvious swelling in her arms/ shoulder joint/ collar bone.
If the impact of the fall was on her shoulders, there might be a soft tissue injury
or injury to the bones in arm or the collar bone.
You may give Ibuprofen
thrice a day after feeds in correct dosage.
If pain and restriction of movements persist, its better to see your Pediatrician
If bone injury
is suspected, X ray will be needed.
Be careful when you put her on the cot. Cot railings will prevent such falls.