。
She always called out when passing by.
Literal
She [topic-は] pass-by [when-とき] [to-に] always voice [object-を] called.
声をかける ('to call out to someone / to address someone') is a versatile set phrase — used for greetings, starting conversations, or getting someone's attention. 通り過ぎるときに ('when passing by') uses a relative time clause. 必ず ('always / without fail') is stronger than いつも — it implies she never missed an opportunity.