Protein help for dialysis?

My mother in law is on kidney dialysis and is having trouble with getting enough protein per day. The dr suggested protein drinks but we can not find any that are low in potassium, carbohydrates, sugars, and have little to no phosphorus. Which people on dialysis the diet needs to be super low in potassium, sodium, carbs, and phosphorus which makes it extremely hard to find something that she likes and can use or eat. Any suggestions are welcomed.

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