Has Amber's hoarding tendencies been discussed in any depth here? Her compulsion to acquire things seems to be another way she seeks mental safety and comfort. I wonder if that just stems from feeling abandoned as a child and wanting to cling to something that couldn't leave her. Like, wanting to psychologically 'stock up' so she always has a surplus of what she might need just incase. That seems to be her subconscious approach with food too. She fails every diet because hunger is an emotional trigger that makes her feel her needs are not being reliably met.
Maybe that's just stating the obvious, but I'd be curious to hear other thoughts on this.