Answer :
The average temperature of the human body is 98.6F (varying). If your mother is having major dizzy spells, please possibly check if she's eaten lately, drank enough water, and gotten enough sugar throughout the day. If this is a daily thing, go to your doctor to see if she has any health issues, such as vertigo.
It should not be life threatening. I would just watch her, and make sure that a fever does not go into play. Check her temperature every hour or so. If it goes up higher, have her take some Tylenol, and if it stays for a matter of days, go check with your local doctor.