At 45 yrs your mother may have a high cholesterol
but a cardiovascular problem needs investigation to be confirmed.
can be due to many other reasons even as simple as anaemia
Even anaemia can cause breathlessness(dyspnoea).
As for the blood pressure if the 120 and 140 mmHg are her systolic blood pressure(that is upper reading ) then it is normal.
A better option is to get her consult a Physician and get her blood investigations and ECG done to rule out any heart problem.