My friend has immunodeficiency, can’t eat, doctors say depression, any advice?

have a friend who has immunodeficiency, and is a vegetarian. A month ago she started eating and every time she does eat she throws it back up immediately which makes her not want to eat, but she can drink liquids fine. She’s been to the doctor and they told her it’s depression and that’s not it at all. Can you guys figure what’s happening and how to fix it? I’m really worried because she’s developed really bad fatigue and I fear there are going to be worse symptoms. Any advice would help, thank you.

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