I believe your question is whether your mother is receiving too many or perhaps unnecessary tests, and I understand your concern. This is a difficult question to answer in part
because heart failure, a flare of COPD, a worsening of kidney function, and anemia, could all present as a feeling of "just not feeling well". Your mother's doctor may be trying to pinpoint the exact cause of her problems by doing several tests. The results of those tests may determine which treatments or medications will help her most. I would suggest that one possible way to narrow the possibilities is good communication back and forth with the physician, and a good physical exam. That way, if your mother's symptoms and exam on one visit are more consistent with a specific diagnosis as opposed to another, then perhaps testing could be limited, and treatment started more quickly.