Looks like your wife should be fine with dillution on UA day.

2ozs is all you need for a test but I too have occassionally run into techs who want a little more. You have a choice.
1: Quit smoking for a few days and follow the dillution sticky the morning of the test.I usually do this as a precaution. If they want a little more than 2 ounces I use a little of my heavily dilluted urine.
2: Use the 2 ounces of QF and say thats all you could do. If they won't accept 2 ounces they have to write in the report that you gave 2 ounces but wanted more.