My dog won't eat, drink, has no energy, and isn't pooping. What's wrong?

Gemini needs to be seen by a veterinarian as soon as possible. These are all very non-specific signs, but she could be dealing with an infection, an endocrine or autoimmune disease, trauma or environmental stress leading to behavioural issues. Your vet may want to run bloodwork and check her urine for any signs of illness, and may recommend imaging such as x-rays to help determine the cause. In the meantime, if she is not eating well, you can try boiling boneless skinless chicken in water, shredding the chicken, and feeding her small amounts of the resulting chicken broth and cooked chicken once it has cooled. This is not a balanced diet, but is okay for a couple of days to help encourage her to eat. You can add in some plain boiled white rice or potatoes as well if you like.