There is a lot of critical information missing here: Whats the nature of the injury? What exactly happened? What is the cause of the incident? Was it reported to any ministry?
This 朱女士 might be responsible for the injury as she was the guardian of the kid. Here is downloaded from Wonderland's policy:
Responsible Person:A responsible person is someone who meets all the requirements to ride the ride themselves, is 16 years of age or older, and demonstrates appropriate observed behaviour.
Accompanied By:Whenever a guest needs accompaniment, the accompanying person must meet all the ride requirements, as well as assist the guest. This includes helping the guests in the boarding and exiting of the ride, assisting the guest in maintaining postural control while riding, and assisting the guest down stairs, catwalks, or ladders in case of an evacuation.
On the other side, the owner of the theme park might not be able to waive their responsibility/liability if they cannot proof their 'due diligence' for customer safety.
Go see the accident lawyer than she will know the chance she has.
8岁强卖成人票：游乐场对撞伤负责吗？