Help Please yellowing edges

I have one plant she is a feminized auto flowering easyrider 5 weeks old The problem is that there are yellow spots on some leaves and the edges are a bit yellow. I am wondering if it is heat stress from being outside it has been in the 90's and the next few days it will be over 100. If I put her in the shade will she get enough light? I have not added any nutes lately because I just transplanted last week into new MG organic soil, but it has got a bit worse. I have been using this soil thoughout the grow. I mean I know that is isn't as bad as some of the pics I have seen on RIU. Any help appreciated. Please pay attention to the tips and the edges of the leaves.

I want to know the anwser too, i think this may be starting to happen to my snow white.

I thought that someone would have an answer