Extending his wishes to 70-year-old Gandhi, Modi said on Twitter that he prays for her long life and good health.
A bitter political battle is on in Gujarat between the BJP and the Congress, with Modi and Congress vice president Rahul Gandhi mounting attacks on each other.
Rahul Gandhi is soon to succeed his mother Sonia Gandhi as the Congress president.
Sonia Gandhi, who has been facing health issues, has not campaigned till now in the Gujarat Assembly polls.
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