platelets are what cause blood to clot, so you know that she won't bleed out during surgery with that result. Honestly, her being high by 4 isn't much at all, and it's probably no big deal. I don't know much about the chemistries, but unless the vet said there's a reason to not have the surgery, her levels didn't look too off. I work in a human lab, so I am more familiar with human levels, haha
As long as you feel confident with your vet and their abilities to care for your little one, I would try very hard to relax, and maybe go out shopping for a new toy or 2 while she's in surgery
Good luck to you both!!!!