Right now, the three thousand Sealed Lands have all developed cracks in their seals. As long as someone is not exceptionally powerful, they can easily cross the seal and appear on Earth.
However, the power of these seals remains formidable, and supreme powerhouses are temporarily unable to cross them to reach Earth. Even if they could manage it, they would have to pay a heavy price.
Tian Ling'er's strength is not considered high, so she could easily cross the seal to go to Earth.
Chapter 1088