Molly, babysit for the funeral. Then call her up and quietly tell her that you need to have coffee with her.
It might surprise her when you use the word "need".
When she comes over, talk to her gently, but talk to her. Ask her what is going on. Tell her that she only calls now when she wants something. Tell her that you thought that you two were friends, but friendship isn't based on only using someone. It's supposed to be more. Then listen to what she says.
You two are neighbors. No matter how put out you feel, you have to live next door to her. Burning bridges with a neighbor isn't smart. So pick up your cell phone, text her back telling her when she can bring her child over, and then the next day, tell her you need to have coffee with her.
Good luck - I hope she thinks through this conversation with you, that cool HEADS will prevail, and that you two can work out the friendship you once had.
Dawn