Answer:
Cerebellum.
Step-by-step explanation:
In human brain, the cerebellum is a part of the hindbrain, along with medulla and pons. Cerebellum plays a key role in the motor control and the ability to perform motor functions, such as taking things with hand or walking.
Here Sejal cerebellum is affected because it is hard for her to tie her shoes or type text messages. Both of these activities are motor functions.
With increased level of alcohol intoxication, it can become difficult to perform more fundamental motor functions, like walking.