She had a contract to work for two years, but the contract was cancelled after one year and she is still receiving the salary

There is nothing wrong with
you taking the salary if the contract was cancelled by them, and there was
no refusal to work or any shortcoming on your part. The basic principle in
this case is that a work contract is binding, and that the employee is
entitled to payment throughout the period agreed upon, even if he is not
given any work to do or the employer has no need of him, so long as he is
prepared to work and does not refuse to do so. 

It says in al-Muqni’:
Employment is a contract that is binding on both parties, and none of them
has the right to cancel it, but if he wants to do so before the time is up,
he is obliged to pay the wages. End quote.  

It says in al-Sharh
al-Kabeer (14/436):  Employment is a binding contract which means that
the employee must be given the wages and the employer must be given the
work. If the employer cancels the contract before the period ends and does
not demand the work, the contract is not annulled and he must pay the
wages. 

You should contact the
ministry of education to see about renewing the contract and related
matters. 

And Allaah knows best.