Hello! I've seen a lot of pictures on this s...

Well the first week with natural light could be the issue. With autoflowers, I have learned that they need to grow as much as possible and as fast as possible. Remember, the first week or so, she is developing the root system before she takes off. Therefor, it could be that without much light she took a bot longer than others. Most autoflower growers use a 20 hours light 4 hours dark scheme. Anyways, nothing you can do about it now. Just take care of her and when she starts to stretch (shortly after showing pistils), you'll see a lot of growth at once. Hopefully she will grow a lot! Also, since youre using 90w, try some LST to spread out the canopy for the most efficiency :)