No, it's not just you. She's always mugging and making wild-eyed faces. As I recall, she used to act pretty normal.
@CatherineofAragon One of Palin's first interviews, the disaster one with Katy Curic, was really her. I made a mistake thinking that interview was not the real her. I should have known better. She appeared "dumb", not able to think well to make a reasonable response. The "I can see Russia from my house!", and not being able to think of a book she has read, other strange responses, were the real her. Over time, she got worse. Now, she appears to be on some kind of drug, either alcohol, or something else, as she is bizarre in her responses and in her dress.