lol 45 day flower? not unless its an auto and even then 60-75 days from breaking soil, most plants are like ozzy said, indica dom 8-10 weeks sativa dom/pure sativas are more like 12-14 weeks+. and i see they had flowering going on on 8-14, thats only 8 weeks ago, defently needs more time if 8-14 was the earliest signs of flowers. also as iv said before more then likely it was the few weeks of cold temps at night that stunted her growth, im almost positive of that, dropping down to the 40s at night for weeks before you started moving her indoors at night was the problem, also since it is a potted plant that adds to it as well, potted plants soil/root zone will cool down MUCH MUCH faster then a plant thats planted streight into the ground outdoors, so as the day heats up the soil and roots, in a pot at night there is far more surface area to the pot thats exposed to the cold air as compaired to one in thr ground which will retain more heat throughout the cold nights because there is less surface area being touched by cold. hope that makes sense to yah. its the only major factor i can think of that could be behind the stunted growth. that puny pourch light aint doin it, not enough energy being put out by it to cause the plants hormones to revert to their veg ratios, so thats out as the culprit, do what you can and let it go as long as you can without it being put at risk for mold and such. and you may be right lol overthinking happens to the best of us my friend. just remember "keep it simple" the complex and convaluded arnt always the best.
ooh also for a beginner i highly recommend you keep a written journal of what work you did, like training on what plant, how much you fed them nutes/gal and such... really helps get things dialed in and helps you improve from grow to grow and lets you have a previous grow to reference to when you try something different to see if your new techniques are improving or hurting your final results. just a thought to help you out in the future if/when you grow the same strains again