Mom's best friend insulted mom, asked her not to call her so much, just once a day. She's upset, I feel bad. What to do?

Mom and her best friend had a disagreement a few months ago and just the other day made ammends. She missed her terribly and I finally got my mom to get the courage and pick up the phone and call her. All went well..Mom was so happy..seemed they were both happily reunited..calling eachother talking it up a storm just like old times. All of a sudden, the best friend tells her last night on the phone that she's calling her too much and from now on to call her just once a day or she will call her. After they hung up Mom was very upset and said to me that she will not call her again. Also, the best friend did not call her today. They generally would start with a good morning call but today nothing. I'm worried about her.. she's been quiet all day and sleepy, picking at her food. I feel awful. 😪