You most definately need to get her fixed BEFORE she has her heat cyle. It's not good for the dog IMO to go through, they are so miserable, plus you have the risk of her sneaking out the door and getting pregnant, so I would spay her BEFORE she has her heat cycle. If she goes into heat, it can risk her health by getting mammory gland cancer and that isn't something you want to mess with. So I would get her done as soon as you can.

I hope she does well on Tuesday. Best wishes to sweet Sunny AND you. I will be thinking of you both on Tuesday. let us know how it goes.

Don't worry if she isn't herself for a couple days, she'll be back to normal soon. and make sure you follow the vets orders after she is spayed which I am sure you will. sometimes they keep the females overnight to monitor them, it just depends on the vets.