Other than anecdotal cases, what "Republicans who never voted for a Democrat in their lives" does she have?
Reality check, dems: Donald Trump has overwhelming support within the Republican Party. There's nothing about Kamala Harris that would make a staunch republican want to vote for her. If Harris really had abnormally strong support from groups that tend to favor republicans, it would probably show in polling (which, if you didn't know, tends to skew towards democrats).