My background is in permaculture but there's significant overlap between that and solarpunk. My point of view is that permaculture and/or solarpunk work at the individual level. They work even better at the household level, and even better at the community level, even better nationally, and best internationally.
You don't have to change the whole world to be successful. You're not responsible for the entire world, only your own actions. So be a part of the solution, lead by example and persuade others to do the same. But you're not expected to carry 8 billion humans on your shoulders, all the other animals, the trees, the weight of all of the oceans, etc. People only believe this because it gets repeated incessantly but take a step back and realize how obvious it is that you can't be expected to be personally responsible for basically all of existence. You're not omnipotent. Let go of weird expectations that anyway are probably promoted by fossil fuel types to overwhelm people into inaction.
Be responsible for your own actions, be part of the solution, and let go of the rest.
She's rich enough to be able to easily afford ANY travel type possible, without having to even ask the cost, and she chooses the dirtiest and most expensive one.
If she cared about climate change, she would just intrinsically understand that paying someone else to be a good person doesn't morally justify her being a bad person (aka, how carbon credits are marketed and sold).
Instead of taking a trans-oceanic flight, she could go on a container ship or sailboat. She's a musician and I bet these experiences would be vastly more inspiring than harassing college kids through lawyers.
For domestic travel she could use a vehicle powered by restaurant waste vegetable oil (WVO) instead of fossil fuel. Or she could take an EV charged by renewable sources. Ewan McGregor and Charley Boorman did a 13000 mile (21000km) electric motorcycle trip in 2019 from the southern tip of Argentina to Los Angeles called The Long Way Up, their 3rd such superlong trip, and their first on electric vehicles. They loved it and called it the future, and they had support from a prototype Rivian truck, which therefore advanced the space of electric cars as well. MANY people are doing this, some rich, some poor. For our climate emissions, there's no time left for excuses either for Taylor Swift or for ourselves.