Frankly, I don't think Dolly Parton would have realistically done as much good trying to weigh in on the politics. A lot of her good works were focused in areas that would have likely turned against her if she put herself in opposition to Trump. The people that you might hope to be swayed by Dolly are probably more likely to suddenly dismiss her as some mere entertainer that succumbed to the "woke mind virus" rather than be swayed. Then her philanthropic works would have gained enemies to no practical good result.