Several people on social media questioned why Ms Trump was being thanked.
"Overjoyed by these attractive letters. Reading them is one of the highlights of my week", the White House aide and mother of two said, along with a smiling heart-eyed emoji.
Another wrote, "Whatever staffer made these fake letters to Ivanka Trump, I loved this little touch - was it a commentary on being blinded by greed?"
- dιglγ (@digggles) August 25, 2017 Wow, your dad's drawings look great. Another wrote that Sarah Huckabee Sanders' part-time job is writing Ivanka Trump cards. One sketch in particular grabbed many eyeballs as it depicted a smiley face with green dollar signs for eyes.
See the amusing reactions to Ivanka's post (below).
Not many reactions were positive, but there were a few accusing Ivanka Trump's critics of being jealous and that she shouldn't be blamed if they despise her father as the nation's president.