Ask a landlord-tenant lawyer and get answers ASAP
I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
The Fair Housing Act requires landlords to make reasonable accommodations for persons with disabilities. However, it's unfortunately not considered reasonable for a landlord to have lose money because of your disability. You can request to be let out of the lease, and you can ask to be allowed to sublet, but if you decide to break the lease and move without first finding someone new, then you'd be liable for rent until the end of the lease.
Check your lease to see if it prohibits subletting. If it doesn't, you don't even need the landlord's permission and you can tell her that. If it DOES, then you can send her a written note from your doctor stating that you need to move for your health and that you're going to sublet as a reasonable accommodation under the Fair Housing Act, in accordance with her written permission. She really doesn't have any basis for refusing if you find the tenant yourself, because she doesn't lose any money. As long as you find someone who can pass a credit check, she'll essentially have to accept the new tenant.
It's important that you are 100% satisfied with my courtesy and professionalism. Thank you.