Welcome melovia!!! Awe! Aa new baby Rex. They are so beautiful. And I know it must be really hard to resist handling, but Osprey is right. Especially with a nervous bunny, let her just settle in for a few days.
So for the first night, just let her be. Then after that I suggest just being in her presence – nearby reading a book or magazine or anything that will keep you there, but "ignoring" her. Ignoring is actually a body signal that bunnies use on each other to signify that they are not a threat. You may even find that she’ll begin to feel safe enough to approach you. So as Osprey has suggested – have some healthy treats ready for such an occasion! This can take time for some bunnies, so don’t worry….and don’t give tooo much freedom too fast. Hang out in one room or if you have an xpen, that would be even better to limit freedom while offering exercise.
If you give too much freedom too fast, she will learn how to hide and this can also hinder good litterbox habits.
Keep us updated!