Stripe Seems Worried Now that Panther is Gone

Stripe had been living in the same spaces with Panther since 2009 (along with Scrufty, not pictured). Now that Panther is gone, it seems as if Stripe is nervous/worried - she runs from me and sometimes hides. I tell her Panther went to Heaven, and that she does not have to go there now. but she does not seem totally reassured. They say sometimes animals can understand the intention behind your words. I'm just going to keep reassuring her we won't send her away.