These symptoms are suggestive of a condition called Benign paroxysmal positional vertigo ( BPPV). This is related to the ears. Totally unrelated to vaccination. The condition is Self- limiting. Other causes need to be considered, if the problem persists for long.
Next Steps
You can have a ENT consultation for this. She can be better with simple medicines and exercises.
Health Tips
Ask her to sleep on unaffected right side, so that the problem limits itself.