More details are needed here. On which day was jaundice
What were the investigations done?
What were the bilirubin
levels when your baby was in the hospital?
Usually with treatment, the bilirubin levels follow a downward trend.
If other problems are ruled out, it may be due to breast milk jaundice too... which is a benign condition, that occurs due to certain components of breast milk. In this condition, the levels may be persistently high for 1 to 3 months even. But other major problems have to be ruled out before concluding its breastmilk jaundice.
Have her seen by the Pediatrician
Hope my answer helps you.