If a rat still doesn’t like being held or acts scared of people, it’s probably because she hasn’t been properly socialized. Some rats just naturally have a more fearful personality too. You can help her learn to trust you by using food. It works best to use soft foods, such as baby foods and yogurt, because you can offer them on a spoon and the rat can’t grab the food and run away. Try different foods to see what she likes. You may need to let her try a food several times in the cage before she decides she likes it.
Use the food on a spoon to reward the behavior you want. For instance, use the food to lead her out of the cage and onto your hand, arm, or lap. Then reward her with the food. You have to do it little by little, just small steps at a time. Just give her a little taste each time and gradually make her come out farther and farther each time. As she learns that she gets good treats for being with you, she will be more willing to come out, be with you, and be held.
If this rat is a single rat, it is recommended you get another rat as a companion for her. Single rats often feel very insecure. With another rat friend, your rat will be more likely to trust you.