Nephthys
The Gr8est!!!!!!!!
Lol, Sakura has been intentionally keeping things from Sarada and coloring the facts her whole life, reacting angrily when questioned about those things. Based on what Sarada believes, Sakura has also been actively lying to her about being her mother as well.
Sarada has also received numerous emotionally harmful experiences in a single day. First with Sakura flipping out at her, then finding the hidden picture, then learning that her father is a cold, distant prick, then Sakura being kidnapped and then finding out that (seemingly) Sakura isn't her mother.
ANYONE would react badly in that situation. It's human to lash out and given the circumstances absolutely a sympathetic reaction. Especially considering Sasuke's lack of presence in her life (which again, Sakura never fully talked about) left Sarada emotionally starved and vulnerable, which makes it a double gut punch she finds out that the one parent she did have isn't even that and was seemingly lying to her the whole time.