if u sure, she noticed that you like her, and u can feel she has a lil good feeling on you and 佢會借機會試探下我 too. that means u have pretty good chance.
I suggest you to go ahead, "feeling" & "love" shouldn't restricted or limited by age, environment, people or anything. Thats TRUE LOVE.
Just go ahead and ask her to have number or msn. Dont ask someone else to help you or ask someone else to have her contact information. Be a brave man. I dont know how old you guys are, but i think she must be an adult. And you need to see and treat yourself as an Adult too, so u gotta be brave. Onceagain, If she really has good feeling on you, she wont reject you, plus she is your teacher. And a student has more interactions with teacher is a good thing. But what topic the interaction is? Who knows? So, the next move is yours.
Good Luck
參考: If u need someone to talk to, i will be here, let me konw.