I am a dog trainer and have helped people with this issue before! Here are a few suggestions:
Crating her when no one is home to supervise. Crating is not mean, it is a nice safe spot for her
My dog LOVES her crate, and now chooses to go in it when she wants her alone time. Your choice, some people crate, some do not.
Nylabones are great! My new puppy LOVES them
You can also get puzzle toys that use treats to keep the occupied. She is probably just bored, so do some training with her every day so her brain is tired! As well as lots of play time and walks before leaving her alone. A tired dog is a happy dog
Kongs are great as well, but my older dog rips them up! Even the black, super strong ones. She always manages to pull off the small, top piece of them. If you use a Kong, filling it up with peanut butter works great to keep them occupied.
Hiding treats, and filled up Kongs around the house is also a fun way to keep her occupied while you are gone. Makes her use her head and nose to find them! Treat dispensing balls are great too, just put her breakfast in it and let her go at it while you are gone.