The 29-year-old said the hair, believed to be part of the cow's hide, had come from a £3 packet of frozen mince bought at Iceland's Gosport store.
Ms Stock said Iceland had investigated and given her £30 in vouchers as an apology.
It's completely traumatised her now. She was in buckets of tears. She was enjoying it until she found that and burst out crying.
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Friday morning's forecast for the east of the region
Friday morning's forecast for the west of the region
Detectives have charged two men with the murder of Jason Martin-Smith in Hastings in 2001.