Daughter having trouble for years with voices inside her head

My daughter has been having trouble since 2008 with voices inside her head . She has been in and out of the hospital about 12 times and on several types of medicines . She was an over achiever . She graduated #5 at her high school and was at the top 20 percent in college her first year...I'm soooo. scared I'm going to lose her.....She is starting to get hopeless.....If there is someone who knows of some help or where there may be a place where a study could be done on her ....please let me know.....