Metacam dose I would give is 0.4 ml twice a day.
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She needs no less than 125 ml of fluids per day, and if she were mine I would shoot for twice that.
Tube feeding food if they are dehydrated can kill them.
If she were mine I would do 40-60 ml fluids now, wait 60-90 minutes and repeat. Then do one or two more times at 4-6 hours apart. Once you have done that, then tube food.
I would not give oil of any type, period. If she aspirates oil she could get lipoid pneumonia, which would probably be fatal.
How much did you tube?
25 ml for a hen her weight is only 1% of her body weight. Avian veterinarians recommend to start with 2-3%, so keep that in mind.
25 ml is a safe, very conservative amount to start with, but I think you will need to bump that up pretty quickly.
I worry about the critical care because it's not formulated for birds, so kep that in mind.
What size tube did you get?