Even if true, that's incredibly shitty to say when you know your recovering meth addict mother will read it. Marry Christmas, Mom! I'm guessing her mother said she can't move in next month and won't give her money.
She has a tenuous relationship with her mother even though they go to bingo together. Her mom will have said all sorts of things behind her back. She will have heard all the dirt from Tammy, including things we probably haven't seem spilled online. But Amber's still willing to torch that relationship anytime she's pissed, and assume she can guilt her way right back in.
But it's bullshit. We all know Amber wanted one of those huge sheet cakes from Costco for Christmas.