Tempers were fraying all over Sesshomaru's household. Rin was angry because she had been told she was not allowed to go to a classmates birthday party at an amusement park. It didn't matter how old or responsible the older sibling of the classmate was, a teenager watching ten kids wasn't going to cut it.
Kagome was irked because of Sango. She had become the go-to helper for Sango considering that the two knew each other longer and Sango could trust Kagome to remain calm during an emergency compared to Ayame. As a result, she had been at her friend's place for the better part of the day helping her.
Kagome was also annoyed at Miroku- it just seemed like he didn't know how to do anything! And she knew it wasn't his fault but her nerves were already fraught between dealing with an irate Rin and a pregnant Sango. So when she came in and Sesshomaru casually asked her what was for dinner she had exploded on him. And needless to say that had set off a whole new conflict that she really didn't have the time to deal with.