Sorry, she is out of the office right now.
Sorry, she is out for lunch right now.
Sorry, she is out for lunch right now, she'll be back around 1:00 (1:00 PM).

What time will she be done working today?
When will she leave work today?
What time will she work until, today?

When might she be available to speak with me today?
Can I call her back anytime between 1:00 and 5:00?