Meanwhile former Ukip leadership candidate Ben Walker called for Mr Bolton to resign, accusing him of having "deeply flawed judgement". The nature of their relationship is under investigation by the UKIP leadership, reports the Telegraph.
Marney doesn't hold an official post in the party.
Now The Mail on Sunday can reveal shocking messages in which Ms Marney says that Prince Harry " s "black American" fiancee will "taint" the Royal Family with "her seed" and pave the way for a "black king'.
The messages show that, asked what was "wrong" with black people, she wrote: "Ugly".
At one point, the 25-year-old also called Markle a "dumb little actress" that no one has heard of because this is "Britain and not Africa". "He must go, he must go quickly, he must go as quietly as possible", MEP and UKIP member Bill Etheridge said.
Ominously for him, Mr Oakden said: "Henry is increasingly in a position where he has got hard decisions to make". When informed that one of her messages were racist, she replied by saying "so what?"
Speaking outside her home today (Jan 14) to Mail Online, Marney said: "I'd like to say I'm absolutely devastated by the messages that I've sent and the distress that I've caused anyone by those messages".
She added: "The opinions I expressed were deliberately exaggerated in order to make a point and have, to an extent, been taken out of context".
On Sunday he was accused on Twitter of being in Ms Marney's company when he appeared on television in mid-October.
Led by Brexit campaigner Nigel Farage, UKIP won almost 4 million votes in 2015, 12.6 percent of those cast, on its anti-European Union platform, putting it at the forefront of British politics even though it managed to win only one seat in parliament. However, the party has struggled to stabilize following the Brexit vote, working against an image problem that it is a single-issue party which has achieved its goal. "Yet I fully recognise the offence they have caused", she said.
On her Twitter profile, Ms Marney describes herself as a model, actor and journalist, as well as a Brexiteer.
'I have disappointed them all and let myself down. He was followed as leader by Diane James, who lasted just 18 days after feuding with the party's "old guard". I can not sufficiently express my regret and sadness at having done so'.