Strange Blackberry Kush

Welp, I did think that she'd green up, but it's beginning to look like this really might be a genetic mutation. Apart from the pale yellow green colour over the entire plant from day one to today, everything else is normal. The form, the strength, the development and the overall growth. This plant could be topped now, and normally I would top this at the fourth node in a couple more days, but I think I'll let her grow out, normally, for a change. I'm thinking that if there was some problem causing this then she would be growing so strongly. Anyhooo, should be interesting later on when the purple colours start to manifest. It's difficult to tell how pale she is but you can see from the close up of the leaves that there is an even pale green mottling if you look at the darkest parts of that mottling that would still be much lighter than a normal leaf. EDIT: added final photo, where I took an undergrowth baby leaf that is not in the light from a mature plant so it's a pretty light green, about as light as you'd want to see any plant, this gives a better idea of how pale this blackberry is.