。
She left her children behind.
Literal
She [topic-は] her own children [object-を] leaving-behind made.
置きざりにする (置き去り 'leaving behind' + にする 'make X into') = 'to abandon, leave behind, desert.' 置き去り is a noun built from 置く ('to put, leave') + 去る ('to leave, depart') — 'put-and-leave.' The full phrase carries strong emotional weight: not just a casual 'left them' but an act of abandonment with implications of moral failure. The plain past gives a stark, factual report of the event.