
Did the breeder not give you a diet sheet/feeding guide when you picked her up? In all honesty I think you probably ought to talk to the breeder about diet/fatness/thinness and feeding amounts.
Personally - i wouldnt be feeding bakers at all, bleurgh horrible stuff!
I really cant advise any further on how much to feed but three meals a day really is a must at this age, if you drop down to two you will end up feeding too much in each meal for her to properly digest with a baby sized tummy, because puppies DO eat quite a bit, more so comparatively than the adult dog will.
Puppies ought not be fat, they ought to be a bit lanky and leggy and 'rangey' looking - fat puppies end up with damaged joints (and over fed puppies usually have squitty poo or poo loads).