I had the same problems until I bought
one of these 7 months ago. Life changing. My vegetable intake went from maybe 1 serving every few days to about 5-6 a day. No more problems. Took about 2-3 months for my body to adjust.
Last year at this time I was dealing with the same stuff your wife is dealing with now. My doctor said summer is the worst time for stomach issues because people get dehydrated and don't know it. Dehydration plus lack of fiber causes constipation. I had been dealing with these problems my whole adult life it seemed. Doctor took an ex-ray and it showed my transverse colon was almost entirely blocked. The pain comes from food you eat having to squeeze around the impacted areas. For years the doctor kept harping on me to eat more fiber. Finally the light came on late last year. Now every day i eat (well, drink) spinach, beets, carrots, banana, broccoli, cucumber, all kinds of seeds (chia, pumpkin, hemp, flax), frozen blueberries, unsweetened coconut with a little unsweetened almond milk. Never felt better. If she's eating stuff with very little fiber and then drinking beer (which is going to dehydrate her), that's going to cause her the issues she's dealing with now. The Blendtec basically allows you to drink that salad/water that she needs to not be constipated and feel miserable.
It got so bad for me last year my doctor had me take
magnesium citrate, which cleaned out those impacted areas. Never pooped liked that in my life. Immediately felt better but it's a whole morning spent on the toilet. That's a one time thing though, not to be taken regularly. The uptake in fiber and water is the every day cure.