Help with rental situation

I am a female living in Toronto. My flatmate is looking to sublet her room in our 2BHK apartment as she will be out of the country for four months. While she is eager to sublet to anyone, I have expressed my preference for a female tenant. However, she is not very willing to cooperate with me. Our lease does allow subletting. The only reason why I am not okay with male person living is I have never lived with random guy and I am very stressed and feeling unsafe about this entire thing.

What options do I have in this situation?