low b12 despite injections Are Vitamin Shots Right for You? Pernicious Anemia: Definition, Symptoms, Causes
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Could you book her in with a nurse for a blood test
After talking to my family I realized that it was a severe migraine (this was the first migraine I have had)

These symptoms typically resolve within 24 hours.* Not for Everyone: This therapy is not recommended for individuals allergic to cobalamin (B12), those with liver disease, or those currently taking medications that interact with methyl donors

This means that high serum B12 levels can persist for some time after large supplemental doses

Weisel K
