I honestly don't know how folks have determined your soil is too hot... there's no information on what the soil contains! And I honestly don't think you have anything to worry about at this stage - this seems like a non-issue for me and I'd tell you to just continue with the grow as you have been doing... the lights seem to be at a good height - certainly not too close to the plants - and you don't indicate that you're giving her any nutes yet so unless you're using soil that has a lot of nutrients added into it, I don't see the problem! I'd give her another week or two and reassess... It's early days!
Good luck...