What health insurance plan should I get for my mother?

Hi everyone, my mother is a PR and she is 67 years old this year. She currently is on medication for HBP, cholesterol and osteoporosis/osteopenia. She is a homemaker and does not have health insurance so I was thinking of getting her on one. I understand that with her pre-existing conditions, these will all be excluded. Is there any health insurance plan for such situations, or is she not entitled at all to any options? Thank you.