The "Nothing Compares 2 U" hitmaker, who has three sons and a daughter, took to Facebook to post an emotional message.
"Please accept my sincerest apologies. My child has been suffering with a life-threatening medical condition since early March 2015. It is the type of condition my child will definitely survive, if correct care is taken and is supervised by myself. Otherwise there is no guarantee. That is the plain truth," she wrote.
"Needless to say, this has been and remains a severe family crisis. Like any mother, I have been up all day and night every day and night since I found out my child is suffering...
