What's that smell?

Before she could make a decision, a faint disgusting odor got caught in her nose. She leaned over her tray to ask the cafeteria worker if they smelled something. However, before she could, a bright flash emanated from the counter. A small burst of air knocked her back, and with her adrenaline kicking in, she pushed herself further and fell onto her back. It seems some excess gas from the warming element under the trays had seeped out and combusted at the exact moment she leaned in. Calming down after the commotion seemed to end, she took stock of herself and was relieved that she was unhurt.

However, the same couldn't be said about her outfit...