[link to original on tumblr]
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I got wondering about whether it's in the Shirelles' original though, so I referenced that, and I found that not only is that phrase not there (so it's original to the Zombies' version) but also the chords are different (and not just in a different key). I checked Carole King's version on Tapestry (she co-wrote it), and that has the same chords (in the same key) as the Shirelles'.
The Zombies' version is in A major, but the Shirelles' and King's are both in C major. For the first line of the verses, the Zombies have I ii V (A major, B minor, E major) where the Shirelles and King have I IV V (C major, F major, G major). Back when I figured out the chords for the Zombies' version, I thought that the A major to B minor change was a weird modulation. The original is more conventional... in the first line at least. Both have a III chord (C# major in the Zombies' A major version; E major in the Shirelles' and King's C major versions) starting the third line of the verses, which - as I've pointed out before - is also a feature of "She Does Everything for Me."