Hello, Sure you can use skimmed milk powder or egg white/whole egg daily for her protein needs.
If there are concerns about allergy or intolerance, you can go for hypo-allegenic predigested protein powders available as health drink.
She may need roughly 100 grams total protein (half of it first class, like meat/egg) per day. Little extra may be allowed for athletic training need.
She will not eat meat:eggs etc. I know her needz and know they are not being met. What I need to know is, are there any safe, additives that would boost her protein intake artificially rather than thru her diet. We are working on nutrition but I want to know how I can increase protein intake until she develops a proper diet.