Originally Posted by
cestmoi123
It's not that it's "weird," it's that neither the frozen nor liquid milk are permitted in those quantities.
What rule prohibits bringing
solid items (books, frozen items, shoes, Ipads, etc)?
You may want to review TSA rules (for what they're worth). Frozen liquids are permitted as long as they stay frozen. TSA also allows chapsticks, although anyone who ever left one in a hot car knows how quickly they can turn to liquid. As long as it's solid when you transit the checkpoint, it doesn't matter if it melts later.
If she had 35 lbs. of frozen solid milk, it shouldn't be handled any differently than if she had 35 lbs. of books, 35 lbs. of left shoes, or 35 lbs. of green crayons.
Scan it, swab it, if it passes, let it go.