Big
for you sweetie. You just go right ahead and have a break down here. We all understand and we are right here for you. It's a lot to have to deal with. You'll need to be positive and strong for Missy when you go pick her up, so you just take a little time for yourself right now.
If you have a feeling about spaying her so soon, then I say, listen to that. The pros and cons are so equal on when to do this, IMHO. But her life hasn't exactly been 'normal' lately. She's your baby, and you know her best. Do what you think is right for her and you.
Little Missy!