Hello, I suggest a consultation with an oral surgeon. You report an increase in growth and it is important that you seek professional care. An increase in size can affect function of the jaw and cause loss of multiple teeth with damage to the roots. Your sister should be up to date on her routine exam and cleaning at the dentist. There is a possibility that an infection has formed from a tooth abscess. This would need treatment with an antibiotic such as amoxicillin and further dental treatment such as a root canal or extraction. Anti-inflammatory medication such as acetaminophen and ibuprofen may limit inflammation, but make a dental appointment to diagnosis this advancing condition. Thank you for your inquiry. I hope your sister will feel better soon. I am available for additional questions.