Buying Super top Up Health insurance for a person with existing illness

Hi,

I would like to purchase a Super top up health insurance policy for a person who is a 59-year-old female

Pre-existing diseases:-

1. She is having PSVT problem since 2017.
2. Vertigo Problem

Chola MS agent straightly told that they won't issue a policy for a person who had a history of PSVT.

What are the chances of getting a Super top up health policy for her now?

Please suggest some insurance policies for her.

Thanks in advance

Ankit Saini