Sister gave birth 2 months ago and she told me something scary [possible ED]

Amber
So my sister had a beautiful little boy two months ago and she called me to ask about my experience with an eating disorder (binge eating). She says since she's given birth, all she wants to do is eat. I asked her what she ate that day and the list went on and on- more than she should be eating in a week and it wasn't even 5:00 yet. She wanted to know how she could stop this behavior without help from a doctor since she lost her health insurance recently and can't afford to get it back. I told her to write down everything she eats and keep track of it throughout the day and when she feels herself going to the kitchen when she knows she just ate, to go for a walk with her kids instead. I didn't have any other advice for her other than that because I got help through therapy. Could someone give any advice that could help her? I'm also worried this could be post partum depression. Any help would be great- I don't want my sister to go through the same thing I did, it ruined my body and she's already gained 7 pounds in 7 days.