As you have told that your mother has PANIC attacks which causes shortness of breath
and the relieved with clonazepam
If you use clonazepam occasionally when there is an attack , less than 3 tabs a week then its fine , otherwise dependence and adddiction of clonazepam is high if used every day for more than 4 weeks.
Because high dependence on this drug causes high withdrawal symptoms
of PANIC attack when left the medicine.
Hope this helps.