Unless its perfectly reasonable wanking of her abilities an potential and not something beyond her capabilities.Who could she beat up outside her verse harem series included?
No naruto expanded universe content really shows her as stronger than she already is in the main series. She was guided by Naruto's TSB platform in the Kaguya fight and has pretty tame Ultimate Jutsu cinematics.
Composite Sakura would just have more of a expanded moveset (but not necessarily stronger) due to stuff like Chronicles and the other games.