My Hamster that I got yesterday went down a curvy tube into another part of her cage (a separate container) and acted like she wanted out, but when she climbed back up the tube she got to a point and just stopped. Then she came back down and resumed trying to get out. Any idea why she stopped?
Give your hamster a few days to settle in. Hamsters can behave oddly on their first few days in a new place, it is new and scary for them.
Make sure your cage is large enough for your hamster. They simply are not happy in small cages. It's area should be at least 360 inch2 (around 2300 cm2) but more if possible. In a tiny cage, they will spend a lot of time simply trying to escape and pacing their cage in frustration. Also make sure it has a big enough wheel to run on because they have lots of energy
It sounds mostly like typical hamster behavior. It is probably exploring the cage and learning how everything works/how to get around in the tubes
It could be she just changed her mind, or is stressed and is not sure how to get out since you said you only got her a few days ago.
Maybe let her out a little, waste her energy and when she's tired, put her back in. Just make sure the place has some covered hideouts if she'd like to hide, but set these hideouts in a way that you could get her right back when it's time to go back to cage. And, of course, she might want to climb something too.
It's all on you to make sure she doesn't get lost. And I'd suggest to get a hamster ball, that way she doesn't get lost and she could roam freely in your room. Hamster tubes with treats at the end of them can be very helpful too, as she could feel safe to be in a hideout and get treats when she comes out of it.
But hamster tubes should only be provided when the hamster feels safe around you, or else she might stay in the tube forever. To make the hamster feel less stressed and more safe, put her something in her cage so she could hide under. It's the first few days remember.
But also show her that you know where she is and still you won't hurt her. Touching her, petting her or giving her treats with your hand can make that happen.