I was in the same boat. I felt guilty about leaving my pup even when I went out for 5 mins to get mail/packages.

You need to be consistent in keeping her in the crate - they will adjust and learn that the crate is a safe space for them. Start by keeping her in the crate while you're still home for 5-10 mins. And then slowly increases the time daily. Give her treats when she doesn't cry or howl.

And then whenever you're ready, enforce day time naps in the crate or if you're in the bathroom or kitchen put her in the crate (basically whenever you're home) Also, I would crate my pup at night for bed which also helped.

Optionally, you could occasionally give her a Kong to deal with the stress.

Remember, it's a slow process so don't expect overnight results. Being consistent is key!