post caustic ingestion

[Scrumpi]

hi my sister has ingested clorox a.k.a bleach .she was admitted at hospital and was given iv drip with proton pump inhibitors.xray and endoscopy was done showed to be normal along with a blood test.within 48H she was discharged and send home with some antibiotics ,urine medication and proton pump inhibitors meds.after 14 days of ingestion she was eating normal.now after one month of ingestion she is complain of pain at throat area with inflammation.she also has gerd way before and is under medication.please advise why after 1month she is complaining pain at the throat area