ANY HELP APPRECIATED! having trouble diagnosing my plant

Hi...not new to growing but having problems identifying what's up with this plant..she was transplanted from a 12ltr to a 25ltr about 2 weeks ago..I repotted into plagron royalty which is a flowering soil but had to keep begging due to hot weather

2x 600w
Ph 6.5-6.7
I haven't been using nutes yet as food in soil has been enough.

Thanks

Also to note..I did have a spider mite problem that has been dealt with..and I have 2 other plants in same tent getting exactly the same water and temps that look fine..