NewZealand Cricket said she was "lucid" and able to sit up when she was assessed by doctors at the ground. She had since been taken to hospital for further checks.
A Te Whatu Ora/Health NZ spokesperson said this morning that a 10 year-old girl was brought to Christchurch Hospital's emergency department last night. She was checked over and sent home, the spokesperson said.
Phillips was immediately concerned about the spectator and could be seen looking into the audience after his six.
"We've seen it a few times now. It is so hard to manage, you almost have to have a barrier up in some certain areas where maybe children and people that are vulnerable can sit and be safer.
"GP hits the ball really hard. The young girl that was struck, thankfully at the moment is doing alright which is great to see. GP has obviously shown his concern out there and everyone else is inside so I think she's in the best hands at the moment."
The 12-year-old girl who was struck by a ball at Hagley Oval tonight was lucid and able to sit up as she was assessed by doctors at the ground. She has since been taken to hospital for further checks. pic.twitter.com/NsYLg2WjfD