.....whats wrong with her?

okay my 4 wek old plant is looking great other than this newest set ...i went to bed last night and she was dark green and i wake up this morning and the newest set has developed a verry light green mabe even a yellow color ....what do i do is this normal ....ivve heard mabe if i sprinkle coffee grounds around the base of the plant it will regain its glorious green

a picture would help, your defenition of yellow could be a healthy green for all we know, and new growth dose tend to be a lighter colour, get a picture up and you will get alot more accurate diagnosis

Coffee grounds are acidic. I really don't think they'd do anything for this. Could be not enough light, over-watering . . . new leaves sometimes are lighter until they open all the way?