Thanks for writing in to Healthcare Magic!
The effect of Avil
do not last this long, it seems your mother has high BP
as such and it got detected incidentally at that time.
Another possibility is that she may be having incomplete relief of asthma
and still could be having the bronchospasm
and the sympathetic rush to raise the BP.
Your mother should get evaluated by a physician for evaluation.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!