It is droopy from too much moisture in the rockwool. Rockwool is bad about sufficating seedlings and retaining too much moisture. You can place the cube on a paper towel or something similar to pull some of the moisture out if it to get some oxygen to the root. You have to be really careful until you get roots appearing from the bottom. Once a root comes out then the chances of suffocating are reduced a lot. Hope this helps
To much moisture brother very easy to fix , take dome off for a while and moisture will leave and the roots will be able to breath ..The roots being saturated ain't helping her but after she Fry's out a bit be fine she looks healthy I just started my own fastbuds last week doing great awesome genetics..
Now it's established, take the dome off every other day and let her dry out a little, you don't want to soak the roots, you just want to keep the leaves moist