Greetings from HCM.
You have not mentioned whether your daughter speaks well, i.e, has she developed good speech since childhood & does she converse well? Also if she has any ear discharge/pain etc? If she has been having this hearing problem since childhood, then you should get her ears and hearing checked with the ENT specialist
, to assess if this is a congenital(from birth) problem or not. There are tests available to detect the exact cause of her hearing defect. In order to carry out these tests, first and foremost she needs to have her ears examined to check for any obvious problems. So just visit your ENT doctor soon. I am sure he/she will be able to help you with the problem.