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She can't do that - he's elected by the conservative MPs. He is the one in control of the rules by which she could be removed / sacked by Tory MPs.
Technically, the rules say they cannot sack her in the first 12 months. However, if a majority of MPs vote to change the rules, they can be changed. So in effect - if a majority of MPs want her gone, she would be gone.
The impossible bit seems to be what happens then.
Newsworthily pertinent: