Originally posted by @Tim Lindstrom:because I said soHere's the correct answer to childish behavior. 

Having this type of behavior from the tenants is just unacceptable in my opinion. 

I believe your behavior has taught her it is okay to pay late.

A co-signer does not guarantee good behavior, or zero damage, or zero noise, or zero people parking on the lawn or smoking in the house, or bringing in pets or having loud parties, on and on.  

When showing the house, I try to tune in on the prospects, listening to the questions they ask, what they say and watching their behavior.

It may be worth backing the closing date off some (appraiser taking like a month here anyhow I hear, so you may have time and her behavior probably backed off the date anyhow).

At any rate if you can recognize this behavior as the type you don't want then yeah give him the boot.

He looked straight at the audience and said, the best guide to future behavior is past behavior.

Denied, denied, denied.Applicant B - You could deny her based on her child's behavior.  

Of course we all have terms in the lease that prohibit general disruptive behavior.