Kate McCann's alleged "stalker" sobbed in court and exclaimed, "Why are you doing this to me?" as she claimed to be Madeleine McCann.
Julia Wandelt told Mrs McCann that she was her daughter, which was the "final straw" that prompted the distressed mother to call the police.
Mrs McCann has been giving evidence against 61-year-old Karen Spragg and 24-year-old Miss Wandelt, who are accused of stalking her.
She became aware of communications from the younger defendant around three years ago.
Prosecutors alleged Miss Wandelt, from Lubin in south-west Poland, pushed the myth that she is Madeleine, after she disappeared in Portugal in 2007.
She allegedly stalked the missing girl's parents by making phone calls, sending emails and turning up at their address.
The accused pair deny a count of stalking causing serious alarm and distress to Mrs McCann and her husband Gerry between 2022 and February 2025.
Providing evidence behind a curtain screening from her dock at Leicester Crown Court, Mrs McCann was asked by the Crown's barrister Michael Duck KC about a visit the defendants made to her home address in Leicestershire on December 7, 2024.
Julia Wandelt (right) at Leicester Crown Court
|PA
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Mrs McCann, who noted she had been made aware by police of communications sent by Miss Wandelt as early as June 2022, told the court: "I pulled up on the drive… it was really dark, it was the weekend, we had the gales.
"I was opening the boot to get something out, and I heard someone say 'Kate'.
"I knew it was someone behind me, but I didn't know who it was.
"She called me mum I think, she was asking for a DNA test, asking 'why won't you do a DNA test? and pleading with me."
Questioned about the mannerism of Miss Spragg, Mrs McCann said: "I would say she was slightly more aggressive.
"She was a bit more kind of... 'don't you want to find your daughter?'."
Asked by Mr Duck if she wanted the women there, Mrs McCan affirmed that she did not.
Mr Duck said: "Did you make that plain?"
Kate McCann, pictured right with Madeleine, left
|GETTY
Mrs McCann replied: "I did, I told them to leave. I told them I was distressed."
Asked about how the incident made her feel, she said: "I felt quite distressed, to be honest. I think I had been on edge anyway because of the recent communications from her."
After almost 90 minutes in the witness box, the trial judge gave Mrs McCann a break, prompting Miss Wandelt to sob loudly in the dock and shout, "Why are you doing this to me?".
Mrs McCann said she did not know whether Miss Wandelt had been crying when she turned up at the McCanns' family home, but said the Polish national had been "pleading" and "asking about DNA tests again".