All right I will cook up a hypothetical narrative:
Pippa would attempt to apologize before the stream.
Kiara would not even remember at all, or possibly never even knew at all. Exactly how she had no recollection of Selphy, or the other un-named person who had some supposed history.
Kiara was already going to dominate the conversation like she does in every first time collab she's ever done, but the "I don't think about you at all" would relegate Pippa to 5%. Kiara would very loudly point out how quiet Pippa has been but not have any understanding why.
Pippa crawls back into a hole to die of embarrassment and never speaks to Kiara again.
Kiara quietly wonders why her new friend ghosted her again.
Both Cappips and KFP would be insufferable, as usual.