How do I DM a girl on Instagram and not seem off putting?

There’s a girl that I did track and field with in college. She still lives in the same state I do so we aren’t too far away. I always liked her and thought she was cute but we never really talked in college because our paths never crossed. I want to DM her but I don’t want to seem rude. What do you recommend?
How do I DM a girl on Instagram and not seem off putting?
How do I DM a girl on Instagram and not seem off putting?
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