1. They were gotten rid off long before Indira Gandhi came anywhere close to power. What she did do, was legislate the abolition of privy purses. These were part of the agreement that the GoI had with the princes at the time of accession. Indira violated that contract, because she was in power.

Her primary sins: 1. Emergency 2. Nationalization of banks, and other leftist causes. 3. Abolition of privy purses.