Telugu Desam head and Chief Minister N Chandrababu Naidu formally admitted the tribal legislator and her followers into the party at his residence here.
With this, the total number of MLAs who joined the TDP from the YSRC has risen to 22 (one of them died early this year).
"I am joining the TDP for the development of my constituency," the MLA from Rampachodavaram (ST) constituency in East Godavari district told reporters.
"I will attend the assembly and raise issues related to my constituency," Rajeswari added.
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Defection of YSRC MLAs to the TDP started in February 2016 with Bhuma Nagi Reddy and his daughter Akhila Priya.
Nagi Reddy died of a heart attack in March this year, while 21 others are now with the ruling party though the assembly records continue to list them as YSRC members.
Of the lawmakers who switched sides, four were inducted into the Chandrababu Naidu Cabinet in April this year.
"But there is no question of us leaving the YSRC," those legislators had announced then.
In a letter to President Ram Nath Kovind last week, YSRC chief Y S Jaganmohan Reddy had regretted that no action had been taken against the legislators who crossed over, according to the 10th Schedule of the Constitution, in the last one-and -a-half years despite several petitions filed with the Legislative Council Chairman and the Assembly Speaker.
The YSRC suffered the latest setback two days before Jagan Reddy is set to launch a six-month-long foot march across the state.
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