missing for three days

I have been through so much with the passing of our dog Heather, then Paxil goes to acting strange, like I'm the reason for Heather dying, and she treated me like a stranger you can't trust.First of all I didn't know that a cat would mourn, but Paxil did for Heather.She lay across Heathers grave, refused food, to include fancy feast.I got the pet carrier out, and was going to take Paxil to the vet, and she disapeared.I had to call the vet, and cancil the 2:00 apt, and she said bring her when you can.That cat was gone for three full days, and only came up late to day, and I wanted to love her, and welcome her back, and I as well as be a total stranger to her, and couldn't get near her.I emptied a can of fancy feast, and tried to get it close to her, and to no avail.What have I done, unless she thinks I'm the one responsible for Heather.Open to what ever is necessary to restore the relationship.Mike