Be around her, be at her (floor) level, talk to her, hang out with her until she gets curious and starts to check you out. Basically, be really patient and give her loads of time.

Agreed Chewie!
Like you’ve said, you’ve only had her for 3 days. She’s adjusting to you and her new environment. She’s going to be timid for while until she’s used to the ebbs and flows of your life. Some bunnies can take months or a year to warm up. My Asriel took about 6 or so months till he even started feeling remotely comfortable. Now he’ll hop in your face and sniff frantically while you’re sleeping and lay at your feet and beg for snoot rubs.

Patience is key. Just do what you’ve been doing any eventually you’ll find a way to break through. With Az it was brushing his snoot, which is funny cause now when you go near him with any grooming utensil he’s like nope nope nope xD hand feed her greens or pellets or a small piece of fruit. Stretch your hand out, palm down, if she lowers her head go ahead a pet for a few seconds. Do this whenever she’s willing. And just lay there with her or next to her without even touching her. It’ll do wonders.

Ditto the others. Patience. Personality of the bunny and their past usually plays a big role in how long it will take for a bun to warm up to you. 3 days is very, very early. Keep doing what you’re doing.