I already filed my return so now when i try to file my wife's return, it doesnt let me and tells me that CRA indicates that your return has already filed.

 

Filing

If the CRA is telling you it has been filed then most likely you have filed it already. Please refer to the link below to explain:

How do I know if my return was filed using NETFILE and received by the CRA?https://turbotax.community.intuit.ca/replies/2864697