Last day and moving school

Hi. I have just been informed that tomorrow is my daughter's last day at the school she's in now. She is moving to a school which specializes in autism on Monday and gradually up her time there. As you can probably imagine, she's happy but upset and so emotional. I'm happy for her but at the same time it's going to be really difficult. 

She only made a friend a few weeks ago and I'm glad she did. She usually doesn't because when she does, she usually has to leave them or they leave her so she is pretty upset about having to leave her. They have each others numbers so they can meet up and stay in touch. She is certainly going to miss the teachers there, because they have helped her so much through this journey and are fun to be around and make her laugh. The school was like a family to her. 

I've told her about the positives and what's going to happen but she is sooo upset about leaving and that it doesn't seem real. I don't know how to make this easier for her because Friday, she is meant to be in school but can't as tomorrow is her last day so she'll be at home. What do I do to make her last day easier? Especially when she walks out that gate for the last time? 

Any ideas/advice are really helpful and appreciated. Thanks x