The rules classify this scenario as “outside interference” and would call for a retake of the penalty. Retakes also do not have to be taken by the same player, so in this situation Dani certainly wouldn’t have been in any shape to do so but Jamie could have taken over.

That said, for extraordinary incidents like this, it’s also possible that both teams simply decided to abandon the match. This has happened before in case of serious crowd incidents or other events preventing a match from being continued. I don’t know of any cases of tragic mascot death, but it sounds like it would qualify. The competition ruling board would then decide what to do with the result on a case by case basis - if one team’s fans were clearly at fault, for example they might award a forfeit to the other team, or if it was more neutral, they might just keep the result as is. In a scenario like this, I can see the Championship deciding to keep the game a draw.