She looks great, and her entirely too small outfit both looks well drawn and does a great job showing off her plump shape and making your eyes wonder all around. her hair, face, bust, belly, bottom, and legs all tug at your eyes.
Fat: probably, although it looks like plump to me; Cute: unquestionably! I'd say the cake is adhering to all the right places, making her voluptuously plump. For all of the extra weight, she is still quite nicely shaped. A good drawing!