Rey Isn't Staying to Live on Tatooine.
According to one of the writers of TROS Rey Isn't Staying to Live on Tatooine.
Here is proof: [url]http://epicstream.com/news/BayaniMiguelAcebedo/The-Rise-of-Skywalker-Writer-Says-Rey-Isnt-Staying-to-Live-on-Tatooine
So maybe after Rey buries the Skywalker lightsabers on Tatooine , She went back to the Resistance or Jakku.