It's possible your glider doesn't want to eat the same thing every night.
For your protein the instant mix should be fine. Give her 1 tablespoons of that every night. The baby premium is unnecessary.
Make sure to giver her a wide range of fruits and veggies. Try peaches, melons, pears, mango and things like that. For veggies try spinach, kale, beets, celery, string beans, Bok choy, etc.
I know my gliders get sick of eating the same thing for a while, and sometimes they just aren't very hungry. Sometime they like something 1 day and hate it the next.