Dealing with the loss of friends because they moved

My neighbor moved and with her my children’s best friends. It was a difficult situation. My children are a bit too young to fully understand the consequences. We watched my neighbor’s children for three days as they prepared for the move and actually moved. My kids loved spending so much time with their best friends. They cried when their best friends drove away for the last time.
My four year old daughter has been asking to visit her best friend, a month after the move. She keeps going to the door and saying, oh they are not home. When will they come home? It would be easier if our neighbor followed through with her promises to both sets of kids. She told them that she would bring her kids to visit. She did not. She sent her boyfriend to pick up their mail from us instead of bringing her kids over to play with mine.

It would also be easier if they could call each other or even do video IM with each other. My neighbor is not interested in letting her kids do that. So suddenly the children my kids have been playing with for half their lives are gone. Now as a parent I have to find some way to teach them how to deal with this loss.

And it is a loss to them. It is not like they can get into a car and visit their friends. They cannot call them or visit them. They are just gone. We have talked about it. My oldest seems to be doing ok. I know he misses his best friend but we are hoping he will make new friends when he goes to grade one. My daughter keeps expecting her best friend to come home and play with her. I am hoping that going into JK will give her the opportunity to make new friends and move on. Only time and new friends is going to make this any easier on my children. Oh, and lots of hugs from Mommy.