Is your mother on any medication’s to lower her blood pressure. If she is, she needs to talk to her doctor because it’s going too low
If she is on many medication’s, you need to check to see if any of them can cause the blood pressure to go low
You need to be a private eye and checking all her meds that means talking to a pharmacist or or and googling them for a side effects
You didn’t say hello it was going
I would get your mother to the doctor as well. Go with her if you can and ask your questions.
Does low blood pressure run in your family? People in my family have attended see for low blood pressure and when it starts to grow up, we know there’s a problem
I wish you the very best and figuring this out