The 69 year-old Congress president was discharged from the Sir Ganga Ram Hospital here two days back after successfully undergoing a minor procedure.
She was earlier in the hospital for 11 days for treatment of fever, dehydration and a shoulder injury.
At a function at which noted singer Shubha Mudgal was presented the Rajiv Gandhi National Sadbhavana Award, the Congress Vice President said that Sonia was "very keen" to attend the event, but he and Priyanka Gandhi did not allow her.
Rahul said though his mother was "very very impatient" to attend the programme, he and his sister told her that she should "rest a little bit".
"She is much much better now and will be up and about very soon," he remarked.
Gandhi, who is recuperating after falling ill during a roadshow in Varanasi, also did not visit the Vir Bhumi memorial here on the 72nd birth anniversary of her husband and former prime minister Rajiv Gandhi.