She's a millionaire. She bought it for $20k, it's now worth $2.5m. She's made $2.48m for doing nothing. For someone else to live in that house they would have

She's a millionaire. She bought it for $20k, it's now worth $2.5m. She's made $2.48m for doing nothing. For someone else to live in that house they would have to make a fortune to pay it in rent. She could choose to move somewhere cheaper and have a massive income from either selling it or renting it out, but she doesn't, she's become rich because other people are making the area valuable.