By when should I consider myself officially ghosted?

I made a new friend/acquaintance a few weeks ago at a social group. I asked her to confirm that we’re still on for brunch, as friends on Wednesday. It’s day two since I asked and I still haven’t heard anything from her. However, her birthday is tomorrow, so she might be busy. I noticed she seemed a bit interested in me romantically and since I said I prefer men, she’s been distant. By when should I assume that brunch is cancelled? That she’s not interested in friendship?

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She eventually got back in touch and we had a great time over brunch, this morning. 😊😊😊
By when should I consider myself officially ghosted?
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