She snapped "I'll probably be asleep when you get home,"
She didn't ask a question so it doesn't require a response. She's testing him by being snappy. The test requires a response. "Sounds to me like you could use some sleep." Said with a cheerful voice, spin around with your gym bag and head out the door. You acknowledge her, let her know her CB doesn't bother you and you are a busy man. That show's confidence and a little humor. You don't let her behavior bring you down or affect you. But you don't reward it.
"What is best for my kids is best for me"
Persevere = happily being patient over a long period of time