Watching rabbit for a week, she s scared to come out of the cage?

I ve had her for two days so far.

I m trying to get her some exercise. She seems to be eating well, but drinking a lot less water than normal. I m not sure what kind of rabbit she is, but she s 7-8 months old and about 5 pounds. I feed her the pellet food and hay. She eats some hay but mostly the pellet food. She s noticeably scared or nervous or not used to a different environment from her owners. She s kept in a cage, but I leave the door open for her to leave freely under my supervision. She did not leave the cage for the four hours the door was open. At her owners house she would leave the cage immediately and not re-enter the cage until we had force her to get back in.

So I picked her up and took her out of the cage myself. She kicked a ton as usual because this rabbit does not like being picked up even by her owners. I put her on the ground and she explored a 5 foot radius a little bit. I brought out the towel that she always play with at home and twirled it in front of her. She didn t really play with it this time but more-so attacked it and made growling/snarling noises. Then she immediately jumped to the front of her cage and put both front legs on it, trying to get back in. I ended up putting her back in.

Will she get used to the new environment for the week? Or will she be out of sorts until she finally returns home? I m just worried that she won t drink enough water. She drinks from the bottle with the spout and won t even touch a little bowl of it.