Is repotting harmful if done wrong

You generally don't want to transplant until the roots are more established for photoperiod cannabis because yes it can be harmful. With autoflower cannabis you want to start them in a big pot and just leave them be. Hope this helps.

Transplant shock is a real thing. Thus why most recommend starting autos in their final home. I start mine in 3g to mitigate the risk of transferring to final pot. Although starting in smalls ones helps the risk of Transplant doesn't make it worth it to me. If you mess up Transplant the jump start you gained by starting in small pot will be lost by 10x. If you have to start small and jump up. Then us drynomyco on the rootball when you upsize pots. Dynomyco or greatwhite or mycos are all good options. If you didn't do this then get some immediately and crush it up add it to water and feed it to them during next feed or watering! I also run Recharge, by Real Growers. This gives you all the microbes and bacteria and fungi needed for a healthy root system! Giving her a boost and helping from nute lockout if you ever get a build up in the future. Although you may of stunted her she can still give a great harvest. Although maybe not as big as she could of still a good one. Give some dynomyco or mycos or great white ASAP, then the next watering give Recharge and use it every week or 10 days. That's your best bet to get a good harvest. As always don't over water. These babies need air to breathe in their roots right now. Make sure temp and humidity in check by Google a VPD chart and see if your in correct range for your current stage of growth. This win ensure a path to success for harvest! Next time autos in final pot! Please consider selecting me as the answer so I can be entered for a chance to win grower of the month contest I would really appreciate it if you could 😊 🙏

Yes transplant shock. Don't do it unless you have to. Don't at all on autoflowers.