She wants too much attension, and always demand to be the center of it. Making a big fuss of this small issue when her hu*****and is in a meeting really demonstrates the point that she is the problem.
If she wants to buy it, buy it. What is the point of asking her hu*****and to "pay attension to deals"? She just wants to command people around to make herself feeling important.
If she does not see that herself, she will never be happy with anything she gets in life.