Sam's mom looks like a true Heinz 57 - many breeds in one dog. Sam herself has Jack Russellish markings right now, but it'll be easier to tell when she grows up a bit more, as many breeds look similar as pups. Those markings could also be Border Collie (which would account for fluffier fur), Boxer
(which might account for the wider-than-terrier face), it could be that daddy was a well-mixed mix as well!

My guarantee - she's 100% canine cuteness!