Our new kitten hides in the laundry basket and won't come out even for treats

We just adopted a 3-month-old kitten last week, and she’s been pretty shy from day one. But lately, she’s taken to hiding inside the laundry basket, curling up among the clothes, and even when we try to lure her out with her favorite treats, she just won’t budge. We’ve tried sitting quietly near the basket and softly talking to her, but she seems more comfortable staying put. We want her to feel safe and come out to explore and play, but she’s really stuck in this little laundry cave. Could it be the smell of the clothes or maybe the shape of the basket that makes her feel secure? Has anyone else had a kitten who preferred hiding spots like this? What helped your shy kitty come out and start trusting the new home?