I don't believe the vast majority of Trump voters will be swayed by her. For one most probably know little about her and she'd be persona non grata by virtue of being a Democrat.
Then you've got the Trumpettes who are more in the know and pretend to support Gabbard because she makes the other Dems look bad. But if it really came down to it I honestly highly doubt they'd pick her over Trump. Trump just activates a certain kind of tribalism in them, best encompasses by the "trigger the libs" meme, that is irresistible to many of them.
IMO Home Alone Trump would've been the GOAT POTUS