The 24-year-old received the hurtful tweets on a recent business trip.
"I checked my Twitter stream and saw these horrible comments. People can be really rude," she told the Diary.
Louise started working for a drinks distribution company 10 months ago. She had finished treating punters to complimentary drinks, when one of the girls posted: "Hate to have been fired from Hotpress. Now you're serving drinks, you commoner."
Louise said: "I was upset by it."