I noticed you said that her poop is not completely normal. This right there is cause for concern for me. It's possible that it's nothing and just related to the stress of the situation, but many times abnormal stool is a sign of something more serious. For example, diarrhea is a BIG sign of a more severe case of upper respiratory infection (URI), and untreated it is fatal (and even treated it can still be fatal). Guinea pigs really aren't that sturdy once they get sick. They are prey animals, so instincts teach them to hide their symptoms until they absolutely cannot any longer...and usually that means something serious is going on. NEVER put off going to a vet if you notice anything unusual with a guinea pig's behavior. Any time you see something unusual going on...get to a vet right away. Even a few hours can lead to death depending on how long they "hid" their symptoms.
You said in your first post that you still had to take her into the vet, but that she was on antibiotics. Was this from a previous vet trip? The reason why I ask is that because you want to make sure that she is only taking what she needs to be taking. Some antibiotics are fatal (although in her case, it's obviously not harming her), but you also don't want to be giving her something that may potentially kill off good bacteria if she's taking a medication that she doesn't actually need.
You mentioned that you use shavings for her bedding. What kind of shavings are they? Try to avoid things like pine or cedar...they have been known to mess with the respiratory system of rodents...which can lead to URI. And I know this has nothing to do with your post at all...but because it angers me how many companies market alfalfa based foods for guinea pigs...do NOT feed your girl anything alfafa based. It causes bladder stones. Get timothy hay based food (Oxbow Hay Company is a really great one for this, but there are other companies that do timothy hay based diets. We use Oxbow's Cavy Cuisine).
It does seem like the lack of eating was more closely related to her broken tooth. However the abnormal stool is still a concern. I would still bring her in to see a vet ASAP just to be on the safe side.
I will not be on this weekend very much because I am attending a convention in San Francisco but I will be thinking of you and Teek. I miss our pirate games. We are driving back and forth to the convention so i will be logging on maybe for a few minutes when we get home Saturday and Sunday night just to say hello. thanks for keeping us all posted on Teek's recovery.
), recently passed away. About a year or two before he passed, he had some blood in his stool. He was okay for a while, but he later developed a tumor in his kidney. He was unable to eat, and the best thing to do for him was to put him to sleep. 
