Sorry, but no. Each account is treated individually. Your wife will need to purchase the PLUS feature in order to unlock her own prior-year returns.
See the TurboTax FAQ below for instructions on how to purchase PLUS. How to proceed depends on whether or not she has begun or completed her 2018 TurboTax filing. NOTE: You must make payment for the PLUS feature in order to unlock older returns.
https://ttlc.intuit.com/community/upgrading/help/how-do-i-purchase-turbotax-plus-so-i-can-get-my-tax...
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***