HI, thanks for using healthcare magic
Burning pain is typically neurological in nature (nerve related). This is called
neuralgia.
Neuralgia can be burning, sticking,
tingling, sharp etc
It can be temporary or permanent.
There are different possible causes such as: (1) diabetes
(2)trauma eg
arthritis of the spine
(3)side effect of medication
(4)
vitamin b12 or folate deficiency
(5)liver or kidney disease
(6)exposure to toxins
(7)neurological conditions such as stroke or ms
(8)infection such as shingles
(9)idiopathic- cause not known
If it continues or recurs persistently, then she may be need to see her doctor for assessment which would include physical examination and bloods.
Bloods such diabetes screening, liver and kidney tests,
complete blood count, vitamin levels
I hope this helps