She said: "I don't have any evidence that any other person physically caused Teresa's death."
The court heard Ms McMahon asked GMP on 12 July 2021 to disclose information about any history of violence or abuse from Mr Chalmers.
Giving evidence at the inquest, Det Insp Charlotte Poole said a junior GMP officer had "mistakenly" told Ms McMahon nine days later that she was not entitled to this information under Clare's Law because she was not currently in a relationship with him.
Officers unsuccessfully tried to get in touch with Ms McMahon the next day and again on 29 July to tell her she might be entitled to receive the information.
Det Insp Poole also told the inquest that during the 21 July police visit, Ms McMahon had made a "complaint of broken fingers and a potentially broken rib but had not sought medical attention for those injuries" and did not wish to assist in a prosecution of Mr Chalmers.
She said: "It's not unusual for domestic abuse victims to not want to assist in a prosecution once they've made that report."
Ms Poole revealed Mr Chalmers had been named in "three logs" of domestic abuse reports over an 11-year-period.
These were not necessarily convictions - they could have been accusations or intelligence reports.
Mr Chalmers accepted his relationship with Ms McMahon had been volatile, but said he did not hurt her physically, nor coerce or control her.
Asked by the coroner if he thought unhappiness with their relationship was a factor in her death, Mr Chalmers replied: "No."