history: I overslept and missed my nephews party and really feel bad about it. Yesterday was my nephews birthday party. Unfortunately_comma_ I missed it! Uhmnn_comma_ so how do you  think  she would react? 
current: She was very sad. I felt really bad that I overslept and missed it.
next: Anyway  you have to find a way of better explaining  ,hope he'll  understand? 