Answer to Question a

a. The left lower part of her face and arm are involved.

Answer to Question b

The internal capsule is in the jurisdiction of the MCA. 

Answer to Question c

It is supplied by the deeply penetrating lenticulostriate branches that arise directly from the MCA stem.

Answer to Question d

The fact that she has no aphasia or cognitive problems and no visual or other sensory deficits all agree with a subcortical localization. Presumably one of the lenticulostriate vessels has collapsed, causing a small region of the internal capsule to lose its blood supply and die. The resulting tiny cavity in the internal capsule is described as a lacune.