We have two Photo libraries (one for my wife and one for me, different user accounts on one Mac, El Capitan). Now I would like to move most photos and videos from her Photos library into my Photos library.
How can I do this easily?
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I think the easiest way to do this is to export the photos from her library and then copy them to /Users/[username]/Public/Drop Box. You can access these public folder from every other account on your computer and import the photos into the new library.
Really, you can't.
Short answer, if you like to edit, rate, or adjust your photos. You have no way to migrate photos in libraries non-destructively without paying Apple for iCloud.
It can be done with PowerPhoto's merging capability. It's not free though.