Ms Damania tweeted today, "I quit.. I have not come into Aap for this nonsense. I believed him.. I backed Arvind for principles not Horse-trading."
With her tweet, Ms Damania linked the video of a news report by a TV channel featuring the recording of a purported telephone conversation between a former AAP legislator Rajesh Garg and a man who he alleges is Mr Kejriwal.
Mr Garg has alleged that the conversation is from November last year, just before the Delhi assembly was dissolved and fresh elections were announced. On the audio recording, the two men discuss how to get the support of six of the Congress' eight legislators to support an AAP government in Delhi.
AAP has said the recording is "doctored."
"The recording is completely authentic. I gave this recording to (AAP leader) Kumar Vishwas only. I am surprised how this CD reached every channel," Mr Garg said today.
In elections held in Delhi last month, the Aam Aadmi Party registered a landslide victory, winning 67 of Delhi's 70 seats. The BJP won three, the Congress won none.
But weeks after the win, AAP has been plunged into an internal crisis, with Mr Kejriwal's supporters seeking the ouster of founder members Yogendra Yadav and Prasahant Bhushan, who they accuse of attempting to unseat Mr Kejriwal as party chief and of having tried to ensure that AAP lost the Delhi elections.
Ms Damania had so far stood firmly by Mr Kejriwal in the rift with Mr Yadav and Mr Bhushan.
Arvind Kejriwal is in Bengaluru on a 10-day break at a health farm for naturopathy treatment for diabetes. He returns to Delhi next Sunday.
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