How to best contact that grill

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Hi,
there's this chick I know from a university sports group that I had half a year ago. I only spoke to her briefly in that time and last time I spoke to her was casual and half a year ago.

In the last couple of weeks I saw her a handful of times where she seemed to blush / smile at me. Last time at the cafeteria complex but she only smiled from afar and I didn't think much of it.... until the evening that day when I held my dick in my hand once again...

Problem: now lectures are over and I could only see her in the cafeteria complex by chance within the next few weeks.

so HOW should I talk to her?

should I get her number from the Whatsapp group we were both in ?

should I wait somewhere and then try to 'coincidentally' meet her in the cafeteria complex?

please answer with the reasoning behind the decision. Thank you very much guys!