hello and welcome to hcm forum,
i would like to inform you that
numbness and swelling around the tooth is due to
abscess formation ,
abscess contains pus which causes swelling, initially pain is present but subsequently, pain disappears and only swelling persists.
in such a case, removal of tooth is indicated to prevent infection from spreading to the adjacent tissues.
i advise you to take your mother to a
dentist soon to avoid further complications,
antibiotics, anti-inflammatory medication is required to resolve infection , your dentist will prescribe the same.
kindly avoid hot food and drinks until you see a dentist, do not apply any hot compresses over the swelling.
i hope i answered your query,
i wish you and your mother good health.