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If your wife has provided her authority to include your daughter in correspondence thent he lawyer should do this. As the application is for your wife, your wife will need to state to the lawyer and this can also be done in writing that she provides her authority for the lawyer to also correspond with her daughter in her matter
Once there is express authority the lawyer should also liaise with the daughter. However, if the daughter provides details in relation to your wife's application, this will need to be confirmed with wife as she is the applicant and will need to state that the information she has provided is true, accurate and correct