Claiming she visited the house at the invitation of her brother Deepak, she accused him of "colluding" with AIADMK (Amma) chief V K Sasikala and her deputy TTV Dhinakaran in "orchestrating today's incidents".
Tension gripped the posh area following the developments, prompting police to beef up security.
"Deepak himself made me come by repeatedly making calls. I had no plans to come here today but he asked me to come to garland the portrait (of Jayalalithaa)," Deepa said.
AIADMK Amma camp sources, who were present at the residence, denied that Deepa was attacked.
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They said she made an unscheduled visit and wanted to garland a portrait of her late aunt kept in the front porch of the sprawling house.
Initially, Deepa was allowed to garland the portrait after which she wanted to enter the house, which was not permitted, they said.
"Suddenly, she wanted to enter the house to which we said we don't have the authority to allow. We also pointed to her that the house was locked and asked her to leave the premises," the sources added.
Speaking to reporters, she said a TV camera crew which was present at the residence was also attacked by the guards.
She repeatedly slammed Deepak for today's episode and said she would file a police complaint against him and Sasikala.
Deepa was also seen entering into a heated argument with her brother on why he had asked her to come Poes Garden today. Her husband Madhavan was by her side. Deepak was present when she has arrived.
She said she has sought an appointment with Prime Minister Narendra Modi to apprise him of the situation.
However, he has been for long claiming that he and his sibling are the "legal heirs" for Jayalalithaa's 'Veda Nilayam' residence, located in the posh Poes Garden locality.
Deepak had, along with Sasikala, performed the last rites of Jayalalithaa, who died on December 5 last year.
Earlier, a section of reporters alleged they were stopped from covering Deepa's visit.
The Poes Garden house was occupied by AIADMK general secretary V K Sasikala, a close aide of Jayalalithaa, till she surrendered in a Bengaluru court in February to serve her term in the Rs 66.66 crore disproportionate assets case.
The front portion of the house where Jayalalithaa used to receive her supporters was thrown open to the public for some time in the aftermath of her demise.