Islam is a way of life and we muslims work towards our after-life and not this world. Islam shows us the right method for every act in life. That said, Sania could have pursued her passion for tennis but in a modest dress which could have won her more name. This is an opportunity for her to show the world that muslim girls are not inferior in anyway and islam does not restrict them to pursue their passion. She could have inspired girls to pursue this sport who restrict themselves because of the dress.
I'm sure there's a way out for this. She can dress modestly and even pursue her career. She can try to be a great ambassador for Islam and Indian culture. This is infact another great opportunity for her to earn a name in another area.
May Allah show her the right path and grant her success.