Dont please dont think about medicine. She's too young. Just massage her at night and change her dress to night suit after that. Then close the lights of the room and make everything silent. Keep doing it for a week you'll see the difference.
Also it is said that it takes 3 to 4 months of a baby's life to make her sleep at night. That also in phases of 2 to 3 hours.
I'm in the same boat my baby is 1 month old.... we'll get our sleep dont worry