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Just drag it back into the Dock.

Open your wife's User folder (e.g. by pressing shift + cmd + H) and drag the folder icon into the Dock beside the Downloads folder.

It might be displayed as a stack of files first. You can change that by right clicking (or pressing control and click, or two-finger click on the touch pad) on it and selecting "Display as Folder" in the context menu.
 
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