Did we commit a mortal sin by missing Mass?

My 16 year old daughter missed mass Sunday morning because she was expecting me to wake her up and I didn’t realize it. It was too late to take her so I went without her.
I planned to take her to evening mass but we were Christmas shopping and it got late, and she pleaded to let her stay, and I gave in. Was this a mortal sin on my part? On her part?

The following links should help you better understand the Church’s teaching on missing Mass. If you have any further questions, please contact Catholic Answers directly.

Recommended Reading:

[LIST]
*] Are there any exceptions for missing Mass?
*]Is Confession needed when missing Mass?
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