You are doing the right thing-as other members said, you don't want to deal with heat cycles and you don't want to worry about unneutered male dogs being around. Plus, spaying minmizes some other health risks. I know it's not easy when they have surgery, but know that you have all of us here on YT for support while she's in surgery tomorrow. She'll be home and running around before you know it
I'll be thinking of you and Lola tomorrow, and praying for a fast recovery so that she can be home with you