How would you react ?

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.

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

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.

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