I was never a fan of "Catherine". We rarely see her being warm & fuzzy with "Steve", even though she is clearly his girlfriend. She's gone behind his back to do stuff she knew would upset him. Come on sweetie . . . he's a cop . . . he's gonna find out and he'll be even more PO'd because he found out the hard way.
She hasn't been out of the Navy for very long, so she can easily be 'recalled'.