First indoor grow

Humidity seems a bit low but this looks like the plant is overstrained by water. I would let her dry out while raising the humidity up to 60 or at least 50%. Good Luck and Happy Grow 💚🌱🌈👍

Not even close. You dont need to defoliate until the lighting is being significantly restricted to lower portions of the plant. Normally 4-5 weeks for autos, and usually about 5-7 weeks for regs/fems (about a week before flower) and then a second time for regs/fems about 3 weeks in to flower

How are you watering? With fabric pots it is difficult to over water but it is easy to under water. Many people just pour water around the plant in the middle. This leaves the rest of the soil dry and roots only grow in moist soil. In an extreme case you can have a plant act root bound because it's roots are only in the area you water. With fabric pots you will use a lot of water. When the plant has only 3 or 5 nodes you might water every other day but when the plants get larger they may need watering every day. Water the entire surface of the soil, paying attention to give more water to the perimeter than the core. There is more soil around the edge of the pot and that is where evaporation is high. Fabric pots make it easy though. Water slowly from the top. If water erupts from the side of the pot water more slowly. Water and let it soak in a minute then water more. You should see or feel the outside of the pot get damp. You want the entire outer surface of the fabric pot to get damp. It can take 5 minutes or more for the water to soak all the way to the bottom but you want it all to get damp; sides and bottom. Once you've done that pick up your pot and get to know the weight. When it is dry it is noticeably lighter. Then the next day if the sides of your pot are dry and the pot is light water again. If the sides are still wet the next day, skip watering and check the next day.