why not go with what John calls her twice in John 2? I.e., the mother of Jesus.
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Nothing wrong with using the phrase mother of Jesus so long as its use is not intended to deny the Deity of the Christ. And of course the phrase in no way changes the fact that Mary was His mother!
The phrase *mother of Jesus* was never used in Scripture as a statement of the deity of Christ.
It was always used to identify which Mary of the several in Scripture the Holy Spirit was referring to.