She appears to be small woman with black hair and some wrinkles. This suggests that she is elder. She also has a short fuse.
When her son organizes a sleepover for his friends (Including Tommy and Gus) her husband tries to keep the kids calm and stops them from breaking down the house. But he fails to do so and they don't listen to him.
Probably due to the noise, she wakes up and reacts ferociously when she sees the mess, the broken things and her husband covered in crazy string spray that Tommy sprayed on him.
Angrily she ends the party and sends everybody home.