As per your saying :
" Now, she is not even ready to consult a doctor to prove my ability or live with me at least one day even after repeated requestes from me and her family members. She is firm on divorce & sent me notice...."
So, there were some meeting and conciliation form both the side, and her Parents also convinced her, but she herself not ready to continue with you and sent the present Legal Notice with the False and Sever Allegations against you.
If the situations are as said by you;
You also want to 'SAVE' your marriage;
Parents of both the side are not ready to break the relationship;
Then do one thing, immediately contact the Lawyer Personally who sent the Legal Notice to you on behalf of your wife, explain him all the facts as stated here, but don't forget to bring your ' Family Elders ' along with you.
WARNING: Don't send Reply Legal Notice to the "Alleged Legal Notice", before to Contact personally witht Lawyer.
All The Matter Will Be OK; DON'T WORRY
Even if no solution after contancting with the 'Lawyer' don't worry.
Then issue Legal Reply Notice, but by mentioning all the facts if after the issauance of notices as above.
She can't file a case fof 'DIVORCE' against you; except to file any harassment cases.
But, my advise to involve some Family Elders of both side, your society persons if any, and then lastly if there is any Mahila Societies, for cociliations again and again.