I don't have any specific advice as such but simply to say: can you ask her breeder?
Good breeders will likely have a lot of helpful advice to give you. If this is the food they recommend then they'd also be able to reassure you about frequency and timing of meals as well as the amounts you should be feeding. Incidentally, do you weigh her food? I used to find that just a few grammes difference can affect the output!
Did your breeder keep a pup this time? Mine did, so we had real and current information to compare. My breeder also put her litter owners in touch and we used to email each other to check news and stories (3 years later we still do

) It was really helpful to hear what others had experienced, what weight gains we could expect and how the house training was going!
Hope you get it sorted, or get the reassurance you need
Kindness is the language which the deaf can hear and the blind can see ~Mark Twain