[pigsmakemesmile]

I'm so sorry you lost your pig. Always go with your gut feelings, if you sense something is wrong, then it is. It sounds to me she wasn't eating because of a problem with her teeth. Only a vet and special tools can identify these type of issues. Lack of vitamins and poor nutrition could have accounted for her weight loss, low calcium and lack of vitamin c in her diet could have contributed to her broken teeth. As far as bleeding from her rectum, if she swallowed the broken tooth, there may have been some injury if it tried to pass through her GI tract unless there was something alltogether different going on. Only a necropsy can help determine her cause of death.
Again, I'm so sorry for your loss.