Poor baby, I understand what you and your little girl's going through. Yazmin had separation anxiety once I returned to work. Thankfully, a lot of members here gave me wonderful advice and Yazmin's anxiety greatly improved within a few days and now she's completely comfortable with being left alone.
Here is a list of steps that I followed that worked well for us, I hope it helps your girl.
1. I covered her crate and put her bed in it. The cover helped her feel secure.
2. I leave a tee shirt without buttons, I wore the night before in her crate so she smells my scent.
3. I purchased a Comfort Zone Plug-In Diffuser
Comfort Zone Whining Trembling & Distructive Chewing Diffuser Dog Spray | Stress & Anxiety Relief | PetSmart
4. I also purchased a Thundershirt from one of our members, Maximo. This shirt really helped made her feel secure and I see they're on sale this week also!
Thundershirt Dog Anxiety Treatment Wrap: Pink Rugby
5. I also purchased and downloaded music called Through A Dog's Ear CD's, Vols. 1 - 4
Through a Dog's Ear - Using music and sound to improve the lives of dogs...*and*their people!
6. I leave a TV on for visual stimulation.
I put the CD's on about a 1/2 before I leave and I've learned not go through a long "Good Bye" ritual, just a quick "Be a good girl".
Last but not least, I purchased a Interactive Treat Puzzle to greet her with once I've returned home.