Chopstick length is pretty broad. The kind you eat with vary from 7 to 11 inches.
Figure out a downlow way to ask her about her hairsticks, though something like "oh that hair stick you're wearing is really neat. How long is it?" might work even though that's kind of blatent.
How much her hair compacts will also make a difference, as well as the type of bun being worn. Sticks that are too short obviously won't hold, but thinking you can hedge your bets and overestimate the length isn't a safe bet. Hairsticks that are too long are insanely annoying because they get caught on things and won't be worn either.
What you might be able to do is inquire with some hair toy makers if they'd let you do a gift card.
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