Going under the bed 24/7! (HELP)

My cat Luna has a little habit of going under the bed, I have tried to block her out by surrounding the perimeter of the bed with boxes on one side but she still manages to get under there, and I have tried to get her out by playing with her more but she soon loses interest and guess what? UNDER THE BED!! I am seeking desperate help please give me advice on how to stop her.

How about giving us some feedback on how old she is, how long have you had her and about the environment in which she lives? Are there any elements that might scare her, to make her want to hide? Was she always like that?

Of course, cats do like to "resign" to more confined places when they want to nap, or just get some rest.. Also, I don't know if you noticed, but you built a fortress under your bed, which WILL make her feel even safer, or even cause her to want to "explore"..