Wonder if Sarah wasn't 'officially' connected to Mohd as a next-of-kin because he had her out of wedlock in the late 90s, and then left then a few years later to move back to the US, and didn't officially reconnect with Sarah until 2017. When the letters he was sending weren't reaching Sarah, he might of thought she and her mother wanted nothing to do with him.
Still though, now that RCMP knows that Mohd does have a daughter, they should keep her in the know!! It's BS that her inquiries are being ignored