The 18-year-old goalkeeper has penned a deal until 2024, having already made five senior appearances for Gareth Taylor's side as well as representing England Under19s.
The Manchester-born teenager will now provide additional competition for the Club's goalkeeping department as well as vital cover as she continues to learn her trade.
"This is such a proud day for me and my family," said Keating.
"I've been with the girls for a while, but to be an official City player now is, as I say, just a proud moment for me.
"I started last season expecting to work hard and soak up as much as I could, so to play games for the first team was beyond my expectations.
"I was just a normal college girl who started training with the senior team and all the Lionesses we have and that just increases your maturity and pushes your standards that much higher."
Watch Khiara's first interview on the video above...