Jaundice... questions

I am a FTM and my baby girl has jaundice. When they checked her blood, they said she was level 12.5 and sent us home with feeding instructions. It's been a few days now and I don't really see improvement and it has me worried to death. Has anyone else gone through this? What should we do to help her? I just want it to go away and for her to be happy and healthy.