“What do you eat if hemoglobin is high?”

Eating nutrient-dense and a balanced diet containing fresh fruits, vegetables, whole grains, lean protein and low-fat dairy will help to manage your condition. Thank you.

Get her to primary care. Might be another issue.

A high hemoglobin level should be checked out by a doctor. There are specific medical conditions that make hemoglobin level go up. Some can be serious. Please have it checked out.

I doubt this is something to worry about unless it is very high. It may be just that she was a bit dehydrated when the labs were drawn. This should be followed up with a doctor to fully assess the CBC.

She needs to be work up for certain medical conditions, you may need to contact your pediatrician.

A Patient with vague symptoms often requires long follow up with repeat testing and comparison imaging. The list of conditions which may cause your stated symptoms is long and range from chronic infection, to inflammatory states, to various hematologic cancers. In the US, Oncologists and Hematologists are frequently interchangeable and many are board certified in both specialities because of the overlap in topics.
Ultimately, a diagnosis of lymphoma or leukemia requires a biopsy for confirmation. Either a lymph node biopsy or a bone marrow biospsy. Sometimes peripheral blood testing (Flow cytometry, peripheral blood cytogenetics and FISH studies) can provide critical clues. You should definitely find a good Hematologist Oncologist to follow you for changes that might prompt a more rapid evaluation.

Balance her body back out by creating a daily menu that is 60% raw fruits and veggies. Eliminate dairy and wheat.
Fruit only in the morning. Veggies, healthy fat and carbs for lunch. Veggies and protein for dinner. no energy drinks, no caffeine, no coffee.