hello and welcome to hcm forum,
i would like to inform you that numbness
and swelling around the tooth is due to abscess
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.