Meghan, 40, visited the town in Texas in May after a man armed with an AR-15 semiautomatic rifle killed 19 school children and two teachers at Robb Elementary School. The Duchess placed a bouquet of white roses tied with purple ribbon at a makeshift memorial outside Uvalde County Courthouse.
Her spokesperson said at the time Meghan took the trip in a personal capacity as a mother to offer her condolences and personal support to a community experiencing unimaginable grief.
Since the visit, Meghan has kept up contact, calling a sister of Irma Garcia, who was one of the teachers killed.
Ms Garcia’s nephew took to Twitter to share that the Duchess had telephoned his mother to see how she was.
John Martinez tweeted: “The way my mom just got off the phone with Meghan Markle… the Duchess, she’s so sweet and lovely, she really went out of her way to check on the family, it means so much.”
Meghan also sent a letter to volunteers at Moms Demand Action, a grassroots movement campaigning about gun violence.
Founder Shannon Watts shared a copy of the letter on Twitter, commenting: “[Moms Demand] volunteers and staff have been working around the clock for weeks, so it was moving to receive such a supportive note – and snacks! – from the Duchess of Sussex.”
The note read: “To each of you and your fearless leader, Shannon, a huge thank you for the work you are doing to keep our kids, families and communities safe.
“Please know that while you may feel exhausted by your endless hours of…