@smwatoa My wife went very much went through the "I must, but I can't" cycle as well. You're also in the first week, you're probably not sleeping and it's all incredibly new and stressful.
You've got to to #1, give your wife a break and #2, give yourself a break. There's a lot going on with breastfeeding that she and you can't control. There is real pressure that to be a "good" parent (and especially a "good" mom) that you must breastfeed. Sometimes mom's body, or the baby, or time, or work schedules, or stress, etc., doesn't line up for many reasons that are **not her fault**, and she feels terribly ashamed of it anyway.
Just get the baby fed. You ARE NOT going to ruin or disadvantage your child by giving them some formula, but you might if they don't get enough nutrition. Breast feeding doesn't have to be all or nothing. Mom doesn't have to stop trying and it's possible over time you can reduce or eliminate the need for formula. If in doubt, see a lactation consultant.