Since you still seem to be confused, I'll expand upon hipp0's post and mine from the AGC thread...

$2,000 x 10 orders = $129 fees, $300 cash back = $171 profit
(10 orders = 10 cards x 3.95 activation each) + (10 orders x 8.95 s&h) = $129 fees
$2k card x 1.5%cb x 10 orders = $300 cb
$300 - $129 = $171 profit

$5,000 x 4 orders = $67.40 fees, $120 cash back = $52.60 profit
(4 orders = 8 cards x 3.95 activation each) + (4 orders x 8.95 s&h) = $67.40 fees
$2k card x 1.5%cb x 4 orders = $120 cb
$120 - $67.40 = $52.60 profit

$10,000 x 2 orders = $49.50 fees, $60 cash back = $10.50 profit
(2 orders = 8 cards x 3.95 activation each) + (2 orders x 8.95 s&h) = $49.50 fees
$2k card x 1.5%cb x 2 orders = $60 cb
$60 - $49.50 = $10.50 profit

As I said, the math makes sense.
The fault in her logic really lies with people paying $8.95 to ship each order since you can get unlimited shipping for $99/yr (and as hipp0 said, order more than one $2k card at a time).

If she is really after the "convenience" of earning points she might as well just forgo the $10.50 profit, stop ordering axgc's and buy vgc's directly from the grocery store using her cc.