[Dr. Sivana]

Santana’s mother questioned why a 28-year-old woman wanted to be with her son, who just turned 18 last week.

This is shoddy writing. Grammatically, "her" modifies woman, which makes the sentence read as if the murdered woman had a son when she was ten.

[Dr. Sivana]

Ooops! I guess she didn’t die. Make that “stabbed woman.”

[HIDEK6]

Grammatically, "her" modifies woman,

Grammatically, "woman" is the antecedent of the pronoun, "her."

Adjectives and adverbs modify (change).

Pronouns have antecedents.

[snarks_when_bored]

There’s no referential ambiguity (’her son’ clearly refers back to ‘mother’), so no harm, no foul.

[wideminded]

Santana’s mother questioned why a 28-year-old woman wanted to be with her son,

There are so many levels of wrong in this story,

One of the levels of wrong is that it sounds like the 28-year-old-woman was trying to hold onto her 18 year old boyfriend by telling him she was pregnant.