Please pray for my Niece

My niece is 16 years old; she has been very ill sense Saturday at her sisters wedding. My brother just called and they moved her this morning to the ICU unit at Mott's children's Hospital. I ask you fellow bloggers to please be in prayer for her. They thought on Saturday she had a bad bladder infection, on Sunday they thought it was a bad Kidney infection, and today she is having a hard time breathing and her oxygen levels are very low. Please pray that the Doctor's will be able to find out what is causing all of this. Pray for healing.