She looks much bigger (taller) in that last photo. The Mum being a springer, not a cocker, will make a big difference.
with a mix breed you just don't know how much of each breed you'll get. It's very much a lucky dip purchase.
Does she have any photos of the dig supposedly the DSD?
what has her vet said? Can she visit the bitches vet?
is she just curious or is there a reason for the question??