The Unnao rape survivor was seriously injured in the car accident, while two of her relatives died and her driver too was critically injured.
The woman and her lawyer are admitted at King George's Medical University's trauma centre.
A team of forensic experts will support the five-member CBI investigation unit in Lucknow.
Unnao rap survivor's accident: CBI books Kuldeep Sengar, 25 others including UP minister’s son-in-law
Of the nine persons named in the CBI FIR besides the MLA, there is Arun Singh, the son-in-law of State minister for Agriculture Ranvendra Pratap Singh alias Dhunni Singh in Yogi cabinet.
The state government has recommended a CBI probe into the issue which was earlier made by the Akhilesh Yadav-led party.
The Congress general secretary wondered whether any hope for justice can be expected from the ruling BJP, whose MLA Kuldeep Sengar is an accused in the case.
The CBI was handed over the probe into Unnao rape case when the survivor had claimed that she was sexually assaulted by Kuldeep Sengar, the BJP MLA from Bangarmau in Unnao in June 2017.
FIR has been filed under sections of murder, attempt to murder, criminal conspiracy against the 10 persons.
Raising the matter during the Zero Hour in the House, SP member Ram Gopal Yadav alleged that an attempt was made to 'kill' her.