He doesn't need to put her on the trail and he doesn't need more debates. The only thing that stops a Trump victory is cheating.
I don't thinks she's likable or relatable. I also don't think she's savvy enough to hold her own without handlers (unlike Hilary or Michelle or Barbara Bush).
She can absolutely hurt because she can say something incredibly stupid that will alienate the women they are trying to coax. JD Vance's wife could probably help but putting an indian with a trump/vance sign might dissuade hard core MAGA's. And given how blood thirsty Trump people are, someone might take a shot at her.
Just keep in mind that J.D. defends Trump and his girlfriend Loomer who wants no stinky Indians in the White House. J.D.'s wife will likely never get an invite to the White House if Trump gets a second term. J.D. Vance Just Sold Out His Family to Defend Trump and Laura Loomer J.D. Vance brushed off Laura Loomer’s racist comments, despite being married to an Indian American woman. https://newrepublic.com/post/185988/jd-vance-family-donald-trump-laura-loomer
the guy is competing with Ted "My dad shot Kennedy and my wife has a horseface" Cruz for being the most spineless sycophant