Does my dog enjoy giving me kisses?

Dogs will always lick the mouth parts of those who are higher in the pack. It's called an appeasement gesture. By giving you "kisses" your dog is recognising you as a pack leader. For her, this is the right thing to do and if you're happy with it then no harm done. I would add one word of warning, although most dogs mouths are pretty clean, watch what they've been eating and where they've been licking, other than that, OK.