What flirting tactic should I use?

So this girl made an obvious flirt earlier this week and i want to show her i'm interested in some way. What would the best way to do it now that she has showed interest in me? An important note is that i haven't seen her since that day because of differences in schedules. Also my reaction to her flirt (her playing gently with my hair out of nowhere without warning) was probably unclear from her perspective, i let her stroke my hair around but didn't smile or anything because i was stunned and confused. So would her curiosity on whether i will ignore her, be indifferent to her or be happy to see her after it have increased or decreased since we haven't seen eachothers since?
What flirting tactic should I use?
Add Opinion