Shes already getting big, transplanting her into a bigger pot while still in veg would have helped. more roots= more friuts . However once in the flowering stage, the last thing she wants or can do is to throw out a bunch new roots. She's looking good, i dont think you need to do much. Looks like a Sativa, it depends on some sativas don't really make huge buds, and others like some Colombian and haze strains can get baseball bat-sized colas. But also flower for 14 weeks or more. Mine would absolutely not tolerate temps above 83 degrees. and they tend to not be as heavy feeders as some indicas so watch how much you feed if it is a sativa. if you are looking for big yield, a longer veg time with a bigger plant will give you more buds but you have to make sure you get a flat canopy indoors or you will not get good buds throughout