If you have only had her 2 days then she is still going to be scared, it takes most chins at least a week to settle in to a new environment. I would just let her be for now and get use to the sound of your family, if it's where she is going to be then it's best she gets use to the normal noise. Some chins take longer then a week though, so don't give up hope too quick, some chins can take months to years to fully come around. Bonding isn't something that happens overnight, you need to earn her trust. Just like making a new human friend, you wouldn't fully trust someone you just met 2 days ago, and chins live for 15-20+ years, so they have time to be cautious of who they trust. You also have to keep in mind that a pet store chin is probably not going to have had the best life or view of humans so far, people taping on the glass or poking it if it's in a cage, only being handled for cage changes or people wanting to paw it over, etc.
If possible just sit near the cage and do stuff, read, watch tv, or just watch her for now, let her get use to the sight and smell of you. Try talking, singing, or reading to her to help with getting use to your voice. She should have a sleeping house, just let her be when she is inside it, let it be her safe place where you wont touch her for now. When feeding or tidying up the cage just let her come to you. Once she has had time to settle and get use to your family talking a lot around her, then you want to work on getting her to come climb on your hands and arms in the cage. Depending on her age, if under 6 months she shouldn't have playtime, but if over 6 months you can work on letting her out in a chin proofed area to play once she is willingly coming up to you.
One other thing, chins do need to sleep most during the day, they sleep most during the middle of the day and middle of the night, taking naps throughout like a cat, so you do want the cage somewhere that isn't noisy all the time.
