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Include her in my immigration form,the application is submitted already
By include do you mean change the status from non accompanying to accompanying or did you marry recently and wish to add your spouse to the application?
 
Yes we married recently and i want to add her in my application
How can I?
Raise a webform to inform IRCC on the change in status. You should get a reply from them with documents to send.
It's best not to wait and start collecting the required documentation such as spouse PCC, marriage certificate and updated proof of funds ( if not CEC).
Generally, these are following forms to fill for spouse addition. This was the required docs as stated by IRCC based on my query:

"Furthermore, if you are the principal applicant of a permanent residence application already in process, you could add your spouse or common-law partner, dependent children, and their dependent children to your application, even if they were listed as a non-accompanying dependent in the initial application.

To do so, we invite you to send your add-on request through the IRCC webform available on our website. You can attach the following forms and documents in the field reserved to that effect:

 
Yes we married recently and i want to add her in my application
How can I?
You need to raise an IRCC web form if your application is already submitted. Through this webform, inform IRCC that your Family Composition has got changed as you've recently got married and thereafter, you look forward to adding your spouse in your ongoing application. Provide a copy of the "marriage certificate" for proof.

You can raise the web form here: https://secure.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx

As a response to your web form, you will receive a document checklist from IRCC (as mentioned in the above post by AishB) that you need to provide for the addition of dependant spouse in your application.

Hope this helps. Good luck :)