Thanks for your concern.
1/--
Mild hepatomegaly simply means that the liver is slightly increased in size.
To find the cause she needs blood tests (liver function tests)
2/-- Lymph nodes help body fight disease. They trap and destroy microscopic germs.
Mesenteric nodes are found in a membrane that attaches the intestine to the abdominal wall.
The most common cause of swollen mesenteric nodes is a viral infection of the intestine like that causes diarrhoea. The other common cause is an
upper respiratory infection. Uncommon causes include
tuberculosis, typhoid, crohn's disease,
appendicitis,lymphoma etc.
More often the enlarged nodes are a chance finding on ultrasound & cause in not found.
3/-Small free fluid in
pelvic cavity & POD (pouch of douglos) is also often a common incidental finding on ultrasound scan & has no significance.
4/--Her x ray findings are also non specific.
There is no need to panic.
I would advise you to see a paediatrician who after detailed history taking & physical examination can plan some more tests to solve the problem.
Hope you find the information helpful.
Best regards.