I would remove all but two or three toys for now, make sure that there is at least one perch that is high in the cage as near to the top as possible while still allowing your new bird to perch comfortably on it and make sure that it is clear of food and water dishes so you don't get poopy food and water.
Make sure that the cage is high enough that the bird will be close to eye level when perching and you are there to interact.
this takes care of most of the physical items except that the cage should be near both a window and a wall. If now all is available near a window cover one side of the cage. This will all help your bird to feel safer. Also place the cage where she can see what is going on and join in if she wants to.
This bird is young enough that it may need to be given soft food twice a day, please consider this.
Now for the interaction part of this. Your bird is scared as it is in a totally unfamiliar place which means to her that it maybe dangerous for her and she has no flock around to help protect and keep her safe. Then there is you, a giant that she doesn't know or trust that keeps invading the only space that she has to be in and chases her around the cage trying to get her. You know and I know that you mean her no harm, but she doesn't know this.
This calls for a different approach. you should stay out of her cage except to change food and water and for cleaning. Don't reach in the cage to touch her, she is too scared and has no reason to trust you yet. You should start off slowly and look at her from the corner of your eyes and not directly as that is how a predator looks at them. You want to notice where she is and what she is doing. You want to pay special attention to her body position and how she is holding her feathers, if you are close enough watch her eyes as well to see if they are flashing.
Now you are ready to begin approaching her cage, go slowly and kind of wander towards the cage instead of the direct route. Keep watching as you do this and at the first sign of nervousness stop and start talking to her in a soft voice. Approach only when she is relaxed, if she moves away or her feathers clamp tighter to her body she is not relaxed. If she is fanning her tail, she is not relaxed. This first time all you want to do is to talk to her. do this for 10 to 15 minutes two to four times daily. After the first attempt to go to her in this manner carry a couple of long treat items for her. You may or may not make it to the cage in the allotted time but don't exceed the time limit yet as more shorter sessions will be more productive at this point than fewer longer sessions. You should talk and sing to her the whole time during these sessions as you want her to get used to you and your voice. When you make it to the cage you can start offering treats to her. Just two or three during the whole session so space the treats out. She may not take a treat at first but that is ok. After a while, maybe even several sessions she will take a treat from you through the bars of the cage. You want to stay at this level until she begins to take the treat from you calmly. The next step is to open the door to the cage and sit in front of it and talk and sing to her and offer the treats to her at the entrance to the cage. When she starts taking the treats calmly from your fingers at the open cage door, you can choose to continue by moving the treat further back so that she needs to stretch to reach the treat or step onto your hand to get the treat. Or you can opt to start target training her at this point. here is Michaels training link for this:
viewtopic.php?f=11&t=227 Once you get through this part using either way presented to you, I think that you will have built enough of a trusting foundation that you will know how to continue from your previous experience. However, I would like to suggest that you don't do any more training than this for the first month or two so as to allow your bonding process to build there will be plenty of time for training later on, at this point bonding is the most important thing.