What kind of food should my mom avoid? she has gout again but this time it's in her left toe

See below: She needs to be on medications such as Allopurinol but she should avoid organ meats, red meat, seafood, alcohol, and sugary carbonated drinks.

Foods not the issue: Studies have shown conclusively that a low purine diet has only minimal effect on the serum uric acid level. Diet is not the issue. I agree with dr. Lovell that your mom needs to be on Allopurinol in order to normalize the serum uric acid and prevent future attacks.

Gout and diet: Tart cherry juice is effective against gout; avoid organ meats; fatty meats and alcohol will aggravate gout. Avoid these. Also, drink at least 3 liters fluid per day - this may enhance uric acid excretion - and if you incline diet successfully to mostly whole grain, fruit, and veggies, using egg white for protein, then uric acid levels will come down.