A.H.
Leave a package for her of comfort items: A picture of you and daddy, a favorite toy, her favorite stuffed animal (or friend).
My son is going thru this again in Kindergarten. I have sent him to school with a picture of Hubby and I in his backpack, he selects a special toy every day, I put one of my perfume balms from Lush (this is an all natural item, so it does not harm him in any way -and it smells like candy, so he really likes it!)...and sometimes on the harder mornings, I use the dusting power from Lush as it has some glitter in it on his arms under his shirt (it smells like the balm I put on him, too.). I tell him it is 'my magic powder and it will keep him safe, happy and remind him of me until I pick him up in a little while'.
You just need to find the 'tools' that work for you and your little one. Be patient and don't let your frustration come thru as this only feeds her anxiety more.
And keep in mind... Change for some kids is hard. No matter how long you think the time has been ~ it will take time for her to adjust. She's a bit stressed at this right now.
EDIT: I don't agree with the lipstick trick as there are some cosmetics that can cause a rash due to the ingredients. This is why I prefer natural items in my home and on my body. :)
Lanolin is almost always in lip products and if you have allergies to wool, you will have an issue with this as it is derived from the sheeps sweat glands.