It just snapped to me to answer the rest of your question. I was iffy about the fabric pots also on rootlock, if the fabric holds excess nutes from runoff, stuff like that. I haven’t had an issue with them and haven’t really found anything to really worry about. Plus they are really hard to overwater. Being an auto in later flowering, she’s just gonna suck everything out of a pot that small. More work for you, but she should be ok.
Have you heard of the solo cup challenge? Look it up. Ppl grow amazing plants in a 16 oz cup start to finish. You gotta feed and water more and really all around take better care but you can do it and get pretty good yields. You got this!
Zide of the pot just is for zide of you plant I can talk you about solo cup, one gallon pot and 5 gallon pot all is for you how tall you want you plant and how often need water
Look if you really want to you can transplant ur plants into a bigger pot ,you should have a look on YouTube at Mr Canucks auto grow and have a look a channel called highigan and have a look at the 420_scene and beginner buds
If your at week 6 of an auto your plants are pretty much as big as they’re ever going to get minus the putting on of bud girth , so keep on feeding them an maxing out light and next time try growing in 5 gallon buckets with weekly application of humic/fulvic acid and you’ll start to grow some real beautiful giants.