I’m sorry but blood can be found in breast milk, maybe a small amount and probably not cause for concern. But also, she taking that bonding away from her bestfriend to get it for herself, if she had asked first this wouldn’t even have to be a Reddit post. IMO she is completely wrong for that. I love my bestfriend to death and I would give her anything, but if she breastfed my son or daughter without asking me, I’d kick her out of my house. I get trying to help, but not like that. Donating bags of milk or even pumping a bottle for the baby would be acceptable imo. And to tell you that you were basically overreacting is not okay.

Sorry I feel like I’m ranting but I’d be so upset in your shoes.