The MDs excluded shingles. The rash is all over and it doesn’t hurt like shingles.
In atypical cases, shingles may manifest as a rash without pain, or the pain may not be attributed to shingles. If it is shingles, the anti-viral drug acyclovir is usually recommended in the early phases. Sun exposure and supplemental Vitamin D may also be helpful. A simple blood test can establish if your mother has a Vitamin D deficiency.