Plant Not drinking?

Everyone responding is spot on - your problems could be lack of drainage, low temperatures and not enough air circulation... Stop watering her altogether - let her dry out completely even if it takes another week ... meanwhile, try to increase the temps in the tent and make sure you've got a fan blowing gently around/through the plant. Once she dries out, if it IS a drainage/lack of aeration issue, one thing you could try is to add about 3tsp of H2O2 per gallon to your water and nute solution everytime you water or feed... this will help get air down to the roots and has the added benefit of killing off any fungus that might be starting to invade your root system. The only other thing I would HIGHLY recommend you do is to start a diary. It will help us help you far more effectively if we have access to ALL the information about your grow! Good luck...

You might be overwatering leafs will wilt with Over-watering and under-watering and overwatering they will be soggy in flappy underwater and they will start to get kind of crisp. Also make sure there is air Circulating around the plant a tiny 6 inch fan will do

hai una buona circolazione d'aria? e se hai temperature basse è normale ci metta una settimana ad asciugarsi a me è capitato anche per una decina di giorni poi quando cresce cambia tutto allora vedrai quanta acqua beve

What size pot are you using? Does your soil have a perlite mix? Once a week should be about right but it should definitely be drying out at the end of the week. Could be bad drainage if there’s no perlite. You could also try soaking the middle of the soil and just lightly watering the outside perimeter, a pot that size fully soaked may just be too much water at this stage.