Two weeks ago I got a cockatiel. She is hand tame and loves eating millet! However whenever I open the cage door to let her out she just looks out and goes back in her cage. I haven’t forced her out in any way but I’m not sure what to do now.
Your doing great! Give her time. A few pieces of advice I've gotten on this forum (not mine just passing them along) are to put a perch on the outside of the cage near the door and leave some millet outside that she might want to come out for.
I would also recommend hang a toy that can be perched on (such as a boing Bouncing Boing Small - Climbing Bird Toy 132cm! ) in view of the cage, so if she decides to full on fly out of the cage, she has a safe place designated for her use.
@Zara you are a genius! I hung their "toy" on her cage door today (along with a millet bribe of course!) and Mabel came out almost immediately! The millet tempted her out but the toy piqued her curiosity and made her a bit braver! Usually she comes onto the branch, nibbles millet and goes back...