Hi dear,
Your mothers ECG results you wrote above shows normal heart.
I will try to explain the results to make it clear for you.
1.Pulse: 115,
Sinus tachycardia is normal as long as there is no any other ECG problem seen. Even people at young age can have a little high pulse during activities e.g after walking. So your mothers pulse is normal.
2. Blood pressure 130/80, I think this one you already know it's normal blood pressure.
3.QRS duration 86ms also normal. The normal range is 70 to 100.
4.QT/Qtc :354/473. the range of this depends according to age but it's also Normal specially with the given heart pulse above.
PR int (interval) 120 ms is normal. The normal range is 120 to 200.
3.P-R-T axis: 46 50 48, that's also normal result, it shows that her heart is in normal axis, the normal range is between -30 to +90. as you can see all of them are in the normal range. so it's normal
I hope this has helped clear your mind
If you have any further questions don't hesitate to ask.
Wish you and your mother all the best.