Correcciones

She had bought a flat with mortgage.

But her job has too far from her flat.

Therefore she had had rented a apartment and she had rent her own flat, too She pays rent of living apartment which is close to her new job from her own rent income.

So it has balance and she already pays the installment payment.

Installment payment of mortgage will finished after 3 years.

She is thinking to himself " Already, I can pay installment of Mortgage, If I could second flat, I don't pay rent anymore, and I can use the rent income of my own flat to pay for installment of second flat."