Can it theoretically be NOT fibromyalgia if there is major vitamin D deficiency?

Tl;dr: constant pain, fybromyalgia symptoms, but vitamin D levels are at 5-8% of a healthy human levels, can it be NOT fibromyalgia?

Long version: I'll try to keep this question focused. I met someone first online, then in-person, who lives in Ukraine, in a major city relatively close to the frontline (about 20-25km away). There is military activity, there are air raids and sometimes unintercepted air strikes near daily, but the city residents weren't (yet) ordered to evacuate.

She has depression, and there was some awkwardness before, and recently she confided in me that for the last ~3 months, she has been living with pain all over her body, but mainly head, neck and hip bone, however, she has referred to do many tests. She is doing tests, but she got sick with flu/cold/Covid, and it's not advised to do some tests by her mom while sick. Sometimes her panic (anxiety?) makes her think a lot worse for herself, so she thinks it was longer than that.

Her mom is a medical doctor, and she persuaded her to walk outside daily. She says it hurts a lot, but it helps in the end. She also says that initially she couldn't take a step outside, because her panic/anxiety completely overwhelmed her, but given she no longer mentions it, hopefully it's better now. I don't want to ask directly, because maybe the thought of it can make it worse.

In the meantime, she described how the pain can be at yet another random place every day, or how if panic (anxiety?) randomly starts overwhelming her, she can begin experiencing new pain points every second.

She happily shared her medical reports, her MRIs are completely normal, there is no cancer. A test for rheumatism came has negative. She had a feeling that she is getting insane had a brain MRI. While likely unnecessary, it also was completely fine

She had 2-3 weeks when she said that her constant back stopped essentially completely. But it came back 3 days ago.

One time, she said she woke up with a tooth pain. I Googled something like 'constant pain head spine "tooth"' and came across fybromyalgia. I sent her a page about it, and she says that symptoms really seem to match up. But obviously this is just Googling and only a doctor can diagnose her

The good news that her blood test came back, and she has less than 12.5 nmol/l of vitamin D, whereas the normal range is 150-250 nmol/l , so her levels are at 5-8% relative to norm. Also vitamin K deficiency..

With this finding (i.e., something is finally wrong), she is actually unsure if should see her rheumatologist or her next doctor at all, or fix vitamin D and K first and see if the symptoms disappear.

I try to cheer her up, and try to stay positive myself, but: theoretically, can it all be just be that she needs vitamin D and exercise, and not lifelong 'fibromyalgia'?