Don't worry....she will be fine!!
Lucy got spayed a month ago....she came home that night and was very tired. Just slept the whole night. The next day she was still tired, but getting more like herself. And by the third day she was the same, playful Lucy she is.
And I was lucky that Lucy didn't lick her scar at all. The first night I left her "cone" on....but he hated it.....I took it off of her and she was fine....no licking at all.
A month later she is completly healed. You are doing the right thing, don't worry about it.....she will go through a little pain now, but will be thankful later on!