The nutes are fine. Classic under water/ overwater. That’s the fruit of small pots. It can never get in a rythem and hit her stride.
You pretty much need to be dialed through stretch with an auto or you will end up with a shorty.
Very light newts through seedling… many go to hard here. And keep the rh up and the light intensity down. Once they have their third set of leaves make sure the water is getting to the bottom of the roots without water logging her.
If you cant get a strong growing seedling your auto will mostl likely be tiny.
White Widow is a a pretty good sized auto 30-40”. Depending on genes and should stretch and bush like a sativa typically does… see what she does in strectch as she looks healthy enough.