How to ask her out after a debate about whether pineapple belongs on pizza

Debates like this are easy to misread because the topic is so light. A lot of people will argue about anything if the other person seems fun, so the argument itself tells you very little. Look at what she did after the disagreement. Did she follow up with a question, bring up a point you made an hour later, or start teasing you about your position? Those are signs she was engaged with you, not only with the pizza. If instead she wrapped it up quickly and drifted to another group, she may have been just being polite.

Also notice whether the banter stayed warm when the other people left. If you two kept talking after the group split, that matters more than anything said in the middle of the argument. A good sign is when she continues a thread from earlier, like a half-finished point about the topping order. That tells you she was still thinking about the conversation after it ended.

Once you decide to ask, the message should be a plan, not a confession. Keep it tied to the pizza bit so it feels like a continuation of something you already share, and then propose a specific time and place. This makes it easy for her to say yes without overthinking, and it makes it easy for her to say no without it being awkward. A plan with a small detail, like a pizza place that serves pineapple, gives her a reason to smile and a concrete thing to react to.

Do not add a second layer of feeling on top of the invitation. Saying you have been thinking about her since the party or that you are excited to see her again puts weight on the message she did not ask for. The invitation carries the signal on its own.

Send the message at a normal time of day, within a day or so of the party if you can. A text sent late at night can read as more intense than you meant, and a text sent a week later can read as having lost interest or forgotten the details. Aim for midday or early evening on the next day or two. If she has already messaged you first, reply promptly and match her tone before you make your ask, so the invitation lands in a conversation that already feels warm.

If she does not respond within two days, do not send three more messages. One gentle follow-up after about four or five days is reasonable, and it should be light and easy to ignore. If that also gets no answer, take it as a no and move on, and do not turn the pizza bit into a sore point.