Yes, I noticed that also. However, I don’t remember what the face scratching business was related to.
At her age, I can not imagine how her nerves can still hold up. She has never been hit before like TRUMP and our side of the media have been hitting her. The pressure is increased for the weaker sex. Maybe that is why she announces drinks on the plane, as she reportedly likes to drink, certainly after debates.
Her nose scratch during the Lester Holt sessions was speculated to be a signal to “throw the question to her” without remark - she had a “zinger” ready.