LemLem--Hello. Welcome to the boards! I can speak to the anemia portion of the labs. Your mom's H & H are very borderline (I don't know her lab ranges, some are 11.5 and some are 12.0) for mild anemia. However, those numbers should be in the 14.0 range to be optimal. You didn't say what her RBC count was.
This is my limited knowledge on diabetes. ~Chronic diabetes~ kidney disease, can inhibit production of the RBC's in the bone marrow. Metformin a medication for diabetes can also cause anemia. Sorry, but that's all I know.
Only a doctor, after complete evaluation will be able to tell you what your mom's low counts/anemia is caused from. It may be nothing to do with diabetes. It could be GI related. Last year my mom, 75 yrs. old had her gallbladder removed too. Then, she still had problems so she had a colonoscopy/endoscopy and they found gastritis, H-pylori and Barrettes. Her blood loss must have been from the gastritis, but they never found any fresh bleeding.
Whenever there is anemia, a cause needs to be determined. They need to R/O any internal bleeding. She should also have her B-12 and folate checked, if they haven't done this already because this too can cause anemia. Doctor's don't always check this. Best of luck to you both. Keep us posted. FLFLOWERGIRL