The temp is perfect, the humidity is perfect, but the pH is a bit too low... I'd raise that to 5.5-5.8 and she should really appreciate it. It can go as high as 6.5!
It's just a little TOO acidic for her. I can't see if the rockwool is too wet but you might check that... if it is, just raise the cube a little bit in the pebbles so just a bit of it is in the water... this way, the roots will still get constant nutrition.
Good luck - it's exciting to be at this stage of the journey - enjoy it!