My sister who works at Dollar Tree in Binghamton NY who is a very hard worker and even...

My sister who works at Dollar Tree in Binghamton NY who is a very hard worker and even comes in on her days off got written up by her General Manger all because she called her to register for a question. Manager had a attitude as soon as she walked in. All because she was probably working on a holiday. This Dollar Tree has frequently not been open when they were suppose to be because the managers were running late. About a week ago they were not opened for almost a hour more than they were suppose to be. My sister had to turn customers away for that reason as she had no way into the store. General Manager should not be in charge. Does not treat her employees respectfully. If my sister was such a bad employee then why was she approached before about becoming a manager. I believe you are loosing business because it is a poorly ran store. Thank you for your time.