Yeah my wife is 5'1" or 5'2" also. Any blind spot issues in the CX-5 wouldn't have much to do with height. All cars require you to follow common sense driving habits like signaling, using your properly adjusted mirrors, and looking back (turning your head) to check for cars.
With the CX-5 I thought my wife to do all of the above plus use the BSM (blind spot monitoring) located on the mirrors.