But if it's that cold then you do need to do something about that lol. Growing indoors means you are God, plants outdoors are much more likely to survive fluctuations like that, but even that temp of 48° would be dangerous for an outdoor plant, and you must give the plant the basics of what it needs and if it needs more heat then give it to her. Remember that you are God, and like God, we never see you but the needs are met and it still believes in you and rewards you with your "there for you but you're on your own" style of growing (I'm not religious btw but it's a good comparison lol). Don't over think this and do too much and fuck your shit up...I was that guy for a long time and that's why I say what I do...the less I do, the better they are, but don't be negligent...honestly I think your 3rd grow is your first, by then you well know the genetics you're working with and know exactly what the plant needs and when (unless you're "that guy" too, like me, who tried mixing strains all the time and has no idea what the fuck works with what lol)