Thanks for sharing your concern.
In root canal treatment
,once the tooth is cleaned properly(that is bio mechanically prepared) then there should be no pain.
Therefore i would suggest you to revisit your dentist
and get the canal preparation completed.
once this is done she will have no pain,as the nerves and infected pulp will be removed during this process.
In the same visit you can request your dentist for changing her antibiotic and analgesic
,so that she can have faster relief ,but please remember that in dental treatment just antibiotic and analgesic wont help much.
They are given to localize and minimize the infection,temporarily,where as treatment like root canal gives you complete cure for that infected tooth.
meanwhile ask her to do frequent warm saline rinses.
and maintain very good oral hygiene
Hope it helps.