Try and be more patient, two weeks is very early days.

Emma needs to feel secure in her safe space before she'll want to explore further. Every time you pick her up for no reason or take her out of her safe place, wll increase her insecurity and will encourage her to hide longer.

Shy cats need to be handled carefully.

Our Sandy spent four weeks hiding IN the sofa bed in our spare room before he felt secure enough to leave the room and he moved under our bed for a few more weeks before he made it to the stairs !!!

Last night our Annie head butted my hand the first voluntury affection I have recieved after two weeks of crawling around on the floor talking to her and offering yummy meat under various hiding places.

In her case she is ahead of schedule I was expecting her to take several more weeks before we got a postive reaction from her. It will take months before she is ready to be picked up unnecessarly OR go downstairs etc.

What about adopting another bolder kitten to keep Emma company ?

Else give her six months of peace to come out of her shell and the rewards she will give you will be worth the wait.