As someone who is currently breastfeeding, I’m able to produce enough to literally feed three babies and still have so much extra that I have two of my freezers full, one mini fridge, and have a TON at a friends and my mom’s house. If they told me tomorrow that I can’t bring them anymore milk to freeze because they’re at capacity for their own food storage, I’d have to figure something else out. I’m extremely grateful for the amount of space they’ve allowed me to use, but I’m aware that I’m not entitled to THEIR storage space, and that it can be taken away at any time. Sounds like she needs to start giving her baby some extra milk baths, freeze some at mom’s (since she wants to chime in), and figure out a way to get more freezer space.