You're seriously asking us how much of a harvest you are going to get from a plant that hasn't even gone into flower yet? Sorry... that's a bit like asking how much your kid will earn in his lifetime when he's only a year old... no bloody idea and no bloody way to tell! Lots of things can go wrong, lots of things can go right - just do your best by her and be happy with what she gives you! It'll be more than you have now!
Good luck...