。
She just called.
Literal
She [topic-は] just-now phoned.
ちょうど今 ('just now, right now') compounds two adverbs of precise timing — ちょうど ('exactly') + 今 ('now') — for emphatic 'at this very moment.' 電話する ('to phone, to call') is one of the most common loanword + する constructions; it functions interchangeably with the more idiomatic 電話をかける. The plain past 電話した ('called') without auxiliary or hedge is matter-of-fact — the immediate, no-nonsense report.