Ideally, you should look for a milk bank in a public hospital with your little daughter. There are professionals there, both doctors and nurses, who can guide you properly. If there is no nearest family doctor, pediatrician or nurse, look for the nearest post or UBS.
The greatest stimulus for breast milk production is the baby’s own suckling.
There are several possibilities to explain this problem you are experiencing, and your stress with it may get worse. The first things they will check are the handle and position. The handle means that the baby should grab most of the areola, with little left. Also, the baby’s chin should be in contact with the breast skin.
There are some interesting videos on YouTube directing you to the most appropriate handle and position. If you choose to watch them, please be sure to refer to the Ministry of Health, the Brazilian Society of Pediatrics, or if you have any professionals advising you. (I didn’t post any video links because I didn’t know if I was going to violate any Quora rule)