Two of my girls ate poo, though never their own, always the other dogs. Fortunately they never ate poo outside the garden either, which was a blessing. Although not pleasant, at least I knew my lot were wormed. One grew out of it by 5 months, the other took a little longer, sorry ... 12 months!! I did put pineapple (tinned in juice) on their food, also pumpkin seeds and grated courgette. All apparently can help, I used them but don't think any of them worked, think it really was a case of just growing out of the habit. However, worth trying ... they loved it anyway!
As others have said, pick up as soon as she does it ... can you watch her and instantly call her away from it, so there are no 'issues' over the picking up, ie who can get to it the quickest?! Don't tell her off though, always distract. Good luck, hope the poo kisses don't last for too long