Start feeding it a tea made with a little worm casting, some molasis, and a little superthrive, every other day. (PH it to 6.7)
Put some of the tea in a spray bottle and spray your plant down a little too.
Your plant shouldnt have any def being so young, I bet the soil has a low ph or you have a salt build up or something like that.
Yor plant dosent look that bad, but it does in fact needs help. You should be able to bring her back, but i bet it's going to take a couple weeks.
You probably dont need to add any fertilizer, its most likely a lockout caused by a soil problem. If you lightly feed it a few cups of low strength tea every other day and giver her a few sprits with a spray bottle a few times a day, I bet youll get her to turn around.
I wouldnt transplant it, youll stress it out too much. Get it growing again, then transplant.