I can't get mad at her, she's too cute! Although I am considering sending her to Overeaters Anonymous.
My two cats are the same... one in particular. I have literally resorted to measuring out food portions in the morning.
The hard part is ignoring their begging for food at night. They meow and carry on and trying to get me to go over to their food dish as a "hint" to what they want.
When they start that I just say: "No kiddy! You're a fat cat!"