I would suggest calling the Crockett Cemetery Association and ask if they have burial records. It is possible she had a funeral home marker that has been lost/destroyed. 936) 544-5713.
I doubt that she would be at Lovelady; I'm pretty sure that cemetery was surveyed. As for the one at Percilla I have walked the entire place many times and do not recognize that name.
Waller has been around a long time. Each of these cemeteries has been around for many years, and I doubt they would have listed the wrong city.