"Taking the conversation to the next level" after a job interview: what does this mean?

Someone I know who is slightly neurotic just had a good job interview, and the employer told her they’d like to “take the conversation to the next level.” They want her to come in on Monday (which would entail her taking off a day from her current job.)

How would you read the tea leaves on this? Does this basically mean she’s hired? What should she expect?

The company is relatively small (~40 people) and she’s already had one phone interview and one very long and successful in person interview.