This was fact-checked to be false: source 1 in English, source 2 in Spanish.

1. she wasn't onboard the government jet (also, wasn't even a private jet)
2. she was there a day before to attend a different event
3. she traveled there by a hybrid
4. the rest of her team travelled by bullet train
5. she wasn't allowed on the bullet train for security reasons (though I can't quite see how a car is safer, lol)
6. she has been photographed biking around the city in the day before the climate conferene
7. the person who made the original tweet this article is based on deleted it ~~and acknowledged having made this up~~