[They are part of a gift. So she doesn't help herself OF COURSE, but ...she does think about it. And after careful deliberation she makes an offer. It's mostly in jest because she'll give him his gift regardless of his answer, but the moment she sees Prompto:]

I'm prepared to make a trade for one of your waffles if you're feeling generous on your name day.

[She's smiling playfully now and taking a sip of her drink, a pale yellow thing: elderflower liqueur and ginger ale.]

I might have heard that eating an even number of waffles on one's name day is unlucky.