Speaking as a foreigner, with no dog in this race, I feel Harris' supporters would be wise to shield her, as much as possible, from pointed questions.
She has likeable qualities but, up to now, she appears to have difficulties when closely examined on policy issues. This is going to get tougher as the election nears.
BTW my UK bookmaker now has her odds on to win, albeit by a small margin. He's seldom wrong, which is why he's a very rich man...