How to ask a girl out over a DM?

Anonymous
I like this girl who goes to a school about 45 mins away. I've only talked to her a few times while hanging outwith mutual friends, and the last time I saw her we really hit it off, but I didn't get her number or ask her out. I told myself the next time I saw her I'd ask her out, but it's been about two months since I lst saw her and have no way of cotacting her other than through social media. What do I do/say to maximize the chance she'll say yes, and not come off as weird or creepy?
How to ask a girl out over a DM?
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