my scampi would of done it right up untill he died at 15 if i had let him, funny thing was the dogs he would attack were his own sons
tye and zac who i still have now. in time and with a bit of training she will see she can trust her sister and they will be fine. either that or when the pups bigger she will tell her sister off for attacking her and put her in her place and she wont do it again.