5 year old lying and stealing

My 5 year old daughter (December baby) has always been a collector of small things. When she was younger she always carried a purse full of "stuff."  She graduated to filling her pockets and her backpack. We set a limit of just bringing one thing to school. She has been sneaking things into her pockets right before we get into the car and one time had something (lip balm) that was not hers. It was taken from me. Today she was hiding a lip balm that she took from one of her friends. There is this pattern of lying, hiding her pockets and now taking things. We have talked about the seriousness of lying and stealing. We have tried many things. Talking, taking things away, time outs, not talking, etc. This morning I took the things out of her pocket and threw them out before school. I didn't say a word because I don't want to engage with her on this anymore. Tonight when I caught her hiding stuff in her pajama pocket she wouldn't take it out and show me. When she did she showed me this lip  balm that she got from her friend. I sent her right to bed. What should I do? I'm terrified that she will become a compulsive hoarder, kleptomaniac and liar.