She may have a lower threshold tolerance - no biggie. Try adding in limited amounts of organic cow or goat's milk and yogurts/cheeses. See if that causes the same reactions.
Most people do not care to know or find out about all that is done to cows in corporate farms. It goes way beyond the severe mistreatment and cruelty of the cows (and pigs, chickens, geese, etc) but also has many damaging aspects to human health from consumption of their milk and meat.
80% of American antibiotics go to corporate farms because they dose yup their animals since they have such unsanitary conditions and are routinely very ill. This causes severe problems for ppl - just look at all the Antibiotic resistant bacterial strains!
Growth hormones and inbreeding for certain traits are also issues for human health. Also feeding them a diet of grains and corn - which they would NEVER consume if given a choice - isn't healthy for the meat and causes lots of bacterial infections for the animals.
Organically raised cows, pigs, etc are allowed to roam free (instead of wallowing in 2+feet of poop), graze on flowers, clover, grass and wheat buds, etc as they want, get a good amount of exercise and are not given antibiotics unless specifically seen by a veterinarian and diagnosed. Their milk is sweeter, and both milk and meat will have more healthy forms of nutrition, and less likely to have issues or recalls.