136/36 is strange enough that the first thing I'd wonder is if there was a measurement error
The 36 is way too low. She needs to be seen by a doctor immediately. When my mom's dropped to 90/32, her cardiologist said that was the reason why her liver started failing.
Normal range is 120/80 or less, but bp varies throughout the day and night. Reqarding 136/36 may not be a problem, but shortness of breath could indicate a heart problem or it could be not physically fit.