Answer:
you need not to flirt in front of her.
more a girl like a committed man, with a direct approach.
If you feel that you are in love with her,
take out, if possible - 'and express how much you love her', girls likes if a boy/man having a good eye contact. And, its easy for you to get the result.
You can easily find it, from the reaction, if she has a smile on a expressive eyes, its the sign however they try to flirt quite sometime, but the result is positive..
Cheers!