Demanding is one thing and getting is another. One can make a demand even when he does not need to, he/she cannot be prevented from 'demanding'. So if the maintainance is indeed demanded then you prove that she 'does not need it'.
Yes, She can demand a maintenance from the huband, but a final maintenance amount is decided by the court, taking into account the details of her past and present employment. There have also been cases where if the woman is better off than her husband, the man has been able to get maintenance for himself too. So you should see if you fit this criteria.
I think you should take advice from an experienced lawyer. You should visit www.lawkonect.com. Here you can post your query and a written reply would be provided to you by an experienced lawyer, like in your case your questions about maintenance. You can also avail consultation with a personal lawyer on this matter through www.lawkonect.com. It is very essential that you get to know about your options well and for that i think you should take professional help.