Samantha, the daughter of Thomas Markle, claims she was 'struck' by the message of love from the preacher.
After twenty years of estrangement, the 53-year-old has now offered to reconcile with Meghan in order to bring peace to their family.
'I feel a religious and moral obligation to be open to her and not be vindictive or isolating or hurt,' she said. 'This should ride on her conscience as a moral obligation to at some point communicate with me and be united rather than divided — as that was the whole message.'
Samantha added, 'If she wants to do the morally and religiously right thing then she will and I’m open to that.'
Just a day before, Samantha caused outrage after claiming Meghan's mother Doria Ragland had 'cashed in' on her daughter's wedding to Prince Harry.
Taking to Twitter, Samantha wrote: 'Even Doria cashed in talking to Oprah and some of the first photos out there only she could have had.'
Earlier reports suggest that Doria will be giving an exclusive interview to TV legend Oprah Winfrey, who was one of the first high-profile guests to arrive at the royal wedding.
A source told The Sun, 'The plan is for Doria to film part of her interview while Oprah is in London. That’s why she was invited to the wedding. There’s huge secrecy about what the interview will involve and when it will air.'
Samantha also hit back at claims that she was 'slamming the royals.'
She said, 'I’m sure the world can say, ‘Oh, Samantha is slamming the royals.’
'Well the royals had generations of scandal in their own family.
'You’ve got inbreeding, you’ve got substance abuse, you’ve got alcohol abuse, you’ve got infidelity.
'On what grounds could the royals feel that the Markles are somehow not worthy?
'That’s the pot calling the kettle black.'
Meghan has not yet made a formal statement about her estranged family.