Have you ever seen a car visit & sit at a grave?

I understand, that with dogs this is normal, but that cats usually stay clear of the dead. Yet, our cat Frills, who lost her daughter "Tabitha May", is always out visiting her grave. Even at night when she is usually inside, Frills lets us know that she has to go out. I let her out into the backyard for a while, & she goes straight to the grave of her daughter,Tabitha May. I couldn't believe it the first time I saw her do this, but now it has become a regular thing she does. ... Meanwhile,, she is still hostile towards the new little kitten that my wife saved from the railway tracks.