those rash usually stay on for quite some time
(don't expect they disappear the moment you stop taking the drug/ given other drugs to suppress the reaction)
if she finds breathing difficult/ very dizzy/ black out - then go to AED instead
the rash should fade slowly
if persistent/ same for more than a few days, then go to the doctor again la
For future safety
1) ask the doctor to issue your mom an allergy card
2) remind her to tell any doctor that she sees that she had an allergy