Consider the dialogue below:

Bob: "Hey, long time no see! How have you been?"
Susan: "I've been good, just trying to keep my head above water with all this work."
Bob: "I hear you. It seems like everyone is burning the candle at both ends these days."
Susan: "Exactly! But you know what they say, every cloud has a silver lining. I'm learning a lot."
Bob: "That's the spirit! Just remember, all work and no play makes Jack a dull boy."

Which of the following best describes the meaning of the idiom "keep my head above water" as used in the dialogue?