"I've found the beginning to generally be a good place to start."
Natasha had no idea where the beginning might be. Daisy claimed to have been recruited to SHIELD in the wake of the Battle of New York, but Nat had never heard her name. Not that she knew every single person working for SHIELD, but it was a cause for concern. Especially since she was claiming to still be SHIELD.
Of course, she had seen people saying that they might be from different times, so maybe that was the deal here? She was willing to keep an open mind until she had any proof one way or the other.