Miss Lehane, a Year 1 teacher at Rhyl primary school, Camden, finished four years of study pound;5,000 in debt and is still having to fork out pound;90 a month for her student loans.
Last year, she managed to scrape together enough money to buy a pound;124,000 two-bedroom flat in Walthamstow, northeast London, with her partner. But she now has a one-hour trip to and from work.
She earns more than pound;25,000, benefiting from a recruitment and retention bonus plus an allowance as art co-ordinator.
But she said high living costs plus ever-increasing bureaucracy meant she was considering leaving teaching. "I'm sure I could be doing something a lot less stressful, a lot less hassle, with a better quality of life."