The 78-year-old victim was thrown to the ground at her home in Pettigo at the weekend.
She was assaulted in a similar attack on November 16th last.
The assault comes after a spate of other robberies of older people in Buncrana, Raphoe, Donegal Town and Convoy in recent days.
Another pensioner was beaten up and robbed in Pettigo just five weeks ago.
“This was a very serious attack and showed once again the total disregard shown by thieves towards elderly people,” said one Garda today.
The incident has been condemned by Sinn Fein.
Independent TD Thomas Pringle told us: “These sort of attacks appear to be getting more common and there is a certain type of gang out there now which is specifically targeting older people.
“I don’t know what sort of people these are but it is clear they are very dangerous and I hope Gardai are given all the resources needed to catch those responsible.”
Supt Leo McGinn said officers were following several lines of inquiry in relation to the attack on the pensioner.
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