My Yorkie doesn't so much eat her poop as PLAY with it, scattering poop pieces all over the floor (she's pad trained, and pretty much ALWAYS uses her pad. We pick the poop up and flush it right away when we're home, but during the day when we're at work or overnight when we're sleeping---poop pieces scattered galore!) AND we tried all natural coprophagia (sp?) tablets and also sprayed her poop with bitter spray and also with vinegar and left it----none of that dissuaded her! She still plays with her poop!
So first, are you sure she's eating it and not just playing with it? (Bella has eaten hers before because I saw "evidence" on her pad that it had been there but was nowhere to be found.)
Also, since she's 7 mo. old she may still be teething....causes HORRIBLE breath. Bella is 5 mo. old (almost 6) and ever since she started teething it is absolutely revolting (but I have a sensitive nose anyway.) Brushing her teeth only helps for ~ a day and then....yucko!