Mrs Cooke's body was found in Avon Gorge, Bristol, earlier this month after onlookers saw her climb over the railings with the help of a stepladder in an apparent suicide.
According to friends, the 92-year-old was driven to her death partly because she was "exhausted" by the constant demands of cold calls and direct mail from charities.
The church regular's death prompted the charities watchdog to initiate an investigation into the tactics used to encourage donations.
Currently people who give money to charity must "opt out" if they wish their details to be kept private from third parties.
According to the Telegraph, under new rules, contributors could be asked to tick a box to confirm they are happy to be approached by similar organisations.
The move would help reduce the number of approaches from charities that see people who have made previous donations as "soft targets", particularly if they are elderly.
Alistair McLean, chief executive of the Fundraising Standards Board, said: "One focus of our investigations will be around consent, which will include the issues connected with opting in or out of being contacted by other organisations [when providing contact details to a charity".
"There will definitely be a lot of change, but we need to get this right as it's a complex area and charities need to be able to reach out to people."
Mrs Cooke, who was dubbed Britain's longest-serving poppy seller, left a note saying she was suffering from depression.
In a newspaper interview, she had reported receiving 10 requests a day for money, saying: "My problem is I've always been one that reads about the cause, then I can't say no."
Friends said she spent most of her pension on donations, had 27 charity direct debits and was finding it harder to manage her finances.
