I rejected her in the past, but now like her..?

So this girl asked me out on a date and I politely told her I wasn't into her like that.

Fast forward a couple months and I'm starting to see she has a great personality and etc...

so how do I approach her?

should I be like "sorry I rejected you. (bla bla) happened and now I'm willing to give you a chance"?

or something like "hey so are you still single? if so wanna go out sometime?"

both are 18 if that helps
Updates
+1 y
I'm curious but do you guys think I have a better chance since she used to like me? Or do I got the same chance as someone else who walked up to her and asked her out?
I rejected her in the past, but now like her..?
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