If you are concerned about your three chickens, take them home and care for them in the manner that you see fit.
As for her chickens, if she doesn't want you feeding them, then your don't have the right to feed them.
X 2 - and if you have true concern for their well-being you will need to go through teh appropriate channels for those concerns. At the end of the day, they are her animals and she has given you express instructions regarding them. Just because her feed program isn't the one you would choose there is no way to say that it is/isn't appropriate with what you have posted thus far.
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