I am sorry for your loss.

Holly knows how much she was loved, that is why she bounced back and stuck around with you.

I've been through this several times, and yes once (Not the first but the fifth) I also waited too long by a few days. It happens, we are humans, and our fur kids know this, too. How many times did Holly give you a look, like "only a human would expect me to do that?" LOL, they know and still they love us in return.