Don't be worried about the children,tthe doctor told her.(这个是对worry about 的同意变换)
the doctor told her not to worry about her children.(这个更合理一点,对句式的)
Don't be worried about the children,tthe doctor told her.(这个是对worry about 的同意变换)
the doctor told her not to worry about her children.(这个更合理一点,对句式的)