Assessment

Hia could you please help me with a question, I was put in the support group of esa after a reconsideration transferred from sda and income support, I have recently heard from my freind that they have been called in for an assessment, by the way I didn't have to have an assessment, she phoned up to see why they had called her in as she was only awarded it about 4months ago. Apparently she was told that because it had been nearly 3 years since her last assessment and there was a back log of appointments they gave her the money so she didn't loose out, but now they have an appointment available she has to go, my question is I never had an assessment so could this happen to me I am apparently due to be reassessed in 2019-2020. Hope all this makes sense thanks.