I agree with RP. Tell her upfront, it's not a big deal, not like you know her from real life or anything. It's kind of a cute-ish story, as cute as one can get for the hobby. It will make for a great icebreaker and give you two something to talk about in between pops
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As a provider, what would be weird for me is if you didn't say anything, made an appointment and just showed up saying "remember me?!". Stalker-ish. Just tell her exactly what you said here. Trust me. You'll probably get some good mileage out of it
Go for it! She might end up being an ATF, you never know!