They could be used by staff in some limited circumstances.
The Health Practitioners Disciplinary Tribunal found Sinyukova's actions amounted to professional misconduct.
The tribunal said it appeared Sinyukova had taken a flippant attitude towards the professional consequences of misusing the taxi vouchers.
In an email to the tribunal, she said: "I have no job, no house and no family due to the situation with vouchers - this is ridiculous considering that I was a top student for four years and had excellent people service skills."
The tribunal decided not to impose a fine, in part because of Sinyukova's financial circumstances.
She told the tribunal she had not worked for two years, because she was under investigation and she sometimes lived in her car.
As well as the suspension, she has been censured and ordered to pay some costs.