It seems that this approach works for your wife. I won't suggest that you change what works - especially if you don't mind paying a few extra dollars each week and enriching the 'middle man' who does, it sounds like, little more than sending you supplies and a meter, and maybe? reporting results to her doctor who, it's hoped, knows something about INR management.
For myself, and a lot of others here, I self test and self manage.
I own my meter(s), which I got very affordably over eBay. Your wife already knows how to self test. You might think about comparing the cost of a used meter and purchased strips to the amount being paid to enrich the company that provides you with meter and supplies.
Pellicle and others, including me, can suggest (we really can't advise) dosing and other information that you can choose to use to adjust and maintain INR within range.
(I got my XS meters on eBay, and paid as little as $29 for one that had been 'disabled' by removing the strip guide and battery cover. Roche sent me a strip guide. I didn't ask about a battery cover (but they would probably have sent me one of them, too, if I had asked). Strip prices vary, but usually cost around $5 a strip if you buy more than 24 at a time. )
Owning your meter and strips, and effective self management, can empower you, and make it possible to continue self testing (and management), if your insurance changes, you doctor decides to stop managing your dosing, or something else. (And how much is the doctor charging y our insurance, before deductible, for reading from an outdated dosing matrix)?