Plant Problems Help!

So today when i went to check on my girls i notice that one of them had some leaves turning yellow and they also felt almost like silky?? Any ideas what the problem could be? thanks

newbi
 
I no that would have been very helpful but what can i saybongsmilie i forgot :) Its actually more of a brown color and the leaves dont feel right there SUPER soft like silk almost. To much fert?
 
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