Final answer:
Jane has already informed her parents about her engagement; she called them last night. The sentence should use 'has already called' and 'called' to indicate completed actions in the past.
Step-by-step explanation:
The question you've asked about when Jane will call her parents to tell them about her engagement can be answered using the information provided. According to the context, Jane has already called her parents. The correct way to fill in the blanks for your sentence would be: 'She (has already called) them. She (called) them last night.'
The verbs 'has already called' and 'called' are in the past perfect and simple past tenses respectively, indicating that the action of calling her parents has already been completed before now.