Regardless of her touted chances of winning, let's not repeat 2016.
Get out and fucking vote like your life, and the lives of everyone you care about, and probably the next 10-20 year stability of geopolitics, depends on you turning out to vote.
Her campaign doesn't even think this is true. They are essentially running a "basement" campaign. Zero events off prompter, speaking through surrogates, and trying to ride any potential DNC bump all the way through the election (or at least until early voting is underway in many states).
Harris is deeply off-putting to listen to when she speaks extemporaneously on virtually any issue. Therefore her campaign is banking on more or less hiding her, "freezing" the poll numbers approximately where they are now and avoiding big risks.
Literally the only inflection point that can change the race any further is the debate (or debates) if that happens.