Emma Cox from Oxfordshire bought a VIP ticket and arrived at the festival at about 15:00 BST on Saturday.
The 33-year-old said she immediately noticed problems inside the VIP tent and claimed that members of the public were holding metal poles down to steady the structure amid strong winds.
“We just did not feel safe in there at all,” she told the BBC.
“It felt inside that [VIP] tent like it was the scene from the Final Destination movie.”
Cox said the tent was declared unsafe by security about 30 minutes later, and hundreds of people were moved into an outdoor area.
“[Staff] then shut all the facilities, so we couldn’t use the toilet, we couldn’t use the bar… then when we tried to leave to go and get a drink or anything, we were told that we could not leave the area as it was unsafe.
“It was like being imprisoned into a tiny pen,” she added.
Organisers said some facilities in the VIP area were “temporarily closed as a precautionary safety measure” because of the severe weather conditions.
“While we appreciate these measures may have caused frustration for some attendees, they were implemented solely to protect attendees, artists, staff and contractors while the weather conditions were assessed and monitored.”