She was swanning around buying books and eating expensive cakes, that's why...* Wonders why TJ isn't around when you need her.... *
It is a grammatical rule to put commas around the name/title of someone who is directly addressed.
That's it, really.
From wikipedia
The only reason I've seen is the one Ursa advances, which is that it's effectively a parenthetical snippet which can be omitted.Vocative
Commas are placed before, after, or around a noun or pronoun used independently in speaking to some person, place or thing:
- I hope, John, that you will read this.
EDIT: I've just looked up my Oxford English, and it's of no help. It refers to the comma and the vocative but only as part of a larger issue, saying it's used "After a participial or verbless clause, a salutation, or a vocative" [my emphasis] but the only example it gives is ""My son, give me thy heart" so it doesn't address what happens when it appears in the middle of the sentence.
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