I know Toph believes in tough love but she made some questionable choices in LoK, and there was some favoritism for uh ...little sister of Lin, can't remember her name atm. Toph should have been harder on her, Lin was the one trying to be good and make her proud. 

Leave it to me. We can have Sakura improve on everything necessary to keep away from someone as well as defend herself if the time comes. He's giving her the moves necessary to survive rather than obliterate someone completely. I think they can end up pushing Taro towards a lake so she can use her complete arsenal on him, as of now Gunshot and the standard academy techniques as well as his other tips and advice are all she's got.