Kate James, who was sacked by the actress in February 2015, claimed Ms Heard "did not care about throwing anyone under the bus, if it meant saving her own skin".
But eight days of hearings in London's High Court have so far shown the couple fighting nearly ceaselessly after extravagant parties filled with copious amounts of drugs.
Winona Ryder has said she was "shocked, confused and upset" by allegations that Johnny Depp was abusive towards his ex-wife Amber Heard, according to a witness statement provided in support of Depp.
He claimed Ms Heard was "yelling at the top of her lungs" but said he did not see any sign of redness or injury on her face.
But Bett admitted under cross-examination that the picture attached to his statement was actually sent to him by one of Depp's lawyers.
Bett said the photo he said he took the following year looked very similar, but accepted he could not find the original.
Paradis and Ryder had been scheduled to testify as witnesses on Depp's behalf in the UK High Court case.
"You are lying", defence attorney Sasha Wass told Bett.
"Ma'am you can call me a liar a hundred times".
Mr Murphy claimed he told Ms Heard the penalties for taking animals into Australia without following the correct procedures "could be severe".
On Wednesday, the court heard from Heard's former assistant Kate James who said Heard had "stolen" details of her own experience of being violently sexually assaulted and the actress had used it for her own benefit.
Meanwhile, actresses Winona Ryder and Vanessa Paradis - who are former partners of Mr Depp - will no longer be called to give evidence.
However, Depp's lawyer David Sherborne has confirmed that, despite the actor's wishes, he no longer needs to call either woman.
Heard also carried on as if she was "above the law", with James testifying about the star's legal trouble with Australian immigration officials in 2015, after smuggling her two pet dogs into the country - even though she was allegedly aware of a paperwork issue.
"I have seen that these outrageous statements have been really distressing, and also caused damage to his career because unfortunately people have gone on believing these false facts", her statement said. I would like to go on the record saying that Savannah McMillan is a personal friend, and to my knowledge, has never worked unlawfully or otherwise in the United States.
Paradis said in a witness statement that she had always known Depp to be "a kind, attentive, generous, and non-violent person and father". She pleaded guilty in April 2016 and escaped a conviction after expressing remorse, including appearing in a video with Depp warning about Australia's quarantine laws.
All of which left judge Andrew Nicol sounding slightly overwhelmed.
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