How would you react ?

I'd be a little mad. Unless it's boldly displayed. I like to know what I'm ingesting.

I would want to know. It's one thing to feed your own kids it's a another thing to put your milk in food others will be eating.

That's not cool at all no one wanna drink some one else's Brest milk it for your baby

I would be upset, not knowing about it beforehand. I wouldn't want myself or my family ingesting someone else's bodily fluids. It's not right for her to make that choice for other people without their knowledge or consent.