Dollar Tree

I have a incident today at the store. My daughter put her cell phone inside the green basquet because she was trying to have her Hans free to choose stuff. we were filling the basket with our shopping stuff. We were ready to check out ,I put the basket in the cashier hands she started pulling the items and check it out ,but I forgot to take out the phone .we didn't realize it until we were in our car. We returned to the store and ask the cashier of course she said she didn't see the phone. We are very sure she took the phone. She was very nervous when we ask for the manager. The manager was rude and no helping us a lot. Is a shame the cashier wasn't honest.my daughter is been crying all day and felling desesperate because she has very important school project to finish for school Monday and all the information was in her phone . Is not fair what a little girl is felling sad in Easter day. If just the cashier do a right thing returning a phone that doesn't belong to her. The cashier name is Ashley not a trusted employee of Dollar Tree store in hyw 6 5425 Missouri City TX. This hapend 4/04/15 at 4.28 pm.