A - God, you're lucky. [missing bit]
B - I've been really strict with myself since last Monday.
I'm not sure what the lady says after "God, you're lucky" at 0:52. Could you help me out? Here's the link:
Chocolate Fudge Cake - Catherine Tate Show - BBC
Could it be: I haven't got any will power?
That's what it sounds like to me too.