Oh, I very much doubt there is much effect either way in an election such as the last one. A junior congresswoman on the other side of the country who isn't even closely aligned or heavily campaigning for the candidate in question is not going to move the needle much either way. Those who came in to say otherwise were just fearmongering.I agree with the rest of your post, but I didn't see any particular large activation of Texas young and Latino voters attributed to her above and beyond the expected during the last election, despite her involvement. I don't think she'd change anything in states like Montana either.
But in the primaries, when she was campaigning for Bernie and appeared much more closely aligned to him? I would think that she likely had at least a small impact in how positively young and Latino voters turned out for him, at least compared to a normal primary when both of those constituencies often barely register. As opposed to Pelosi, who I have trouble seeing moving the needle for any candidate beyond backroom plotting.