Hmmm... I'm not an expert, but I think sometimes people confuse true separation anxiety w/boredom... especially when it comes to young puppies.
Bee (my foster) spent a big chunk of her puppyhood living at the vet, crated almost constantly. When she first came to live w/me she was not a fan of being confined again
at all... lots of barking/whining/scratching, even though she had plenty of toys and treats. After she got spayed I was supposed to keep her "quiet", (
) and she pretty much lost her mind... I finally moved her crate into the living room so she could still be "part of the action", and that helped a great deal.
When I have to leave my dogs they are usually all crated in the same room and that also seems to be more acceptable to everyone... no-one feels singled out or left behind.
Young puppies have an incredible amount of energy and they WANT to be right in the middle of everything... and it's not because they're anxious - it's because they're puppies, and pack animals.
How much exercise does Tilly get in the morning? How long is she crated on an average day?
If I know that I have to leave mine crated for several hours I make sure that they have plenty of play time and I encourage LOTS of running around beforehand... usually at least an hour or so.
A tired dog really IS a quiet dog...