Yeah she might be going into labor. You need a ladder, a big sheet or beach towel and at least two people. Or the gif becomes real. Create a couple of escape routes for her like the ladder itself and a taut sheet to the ground on a diagonal.
My cat actually got stuck up a tree and was actually there for a few days. Luckily we got him down but it was definitely a traumatic experience for the little guy.
Cats often get stuck in places they have climbed up to because they heavily rely on their back legs to clime up to these places as their front legs do not have the strength to climb down. It also has to do with the fact that cat claws are good about going up but not so much going down. Plus cats often do not want to go down as they are afraid either of because of something that chased them up the tree or in a sensitive situation (like being pregnant and possibly not too far off from giving birth).