Marcia,
Hello. I am so sorry about ^Molly^. AS I am fairly new here I do not know about her. May I ask what happened? How old she was and how old Taco and Tilly are?
Cat loss/cat grieving is something that I have rarely seen covered. Even our vet never mentioned it to us, so I am under the impression that it is largely ignored here. (I am in the USA) I also subscribe to 2 great cat medical newletters from 2 veterinary universities out here and they are just chalk full of wonderful articles and information. The other month one had an article on helping your cats deal with grief and loss. I felt the article was lacking in substance, but it showed me that perhaps the topic is starting to get known and understood here. Since I have little from veterinary sources on this topic I am going to defer to my own experience.
I asked about ^Molly^, Taco and Tilly because I have found that when cats have been in each others company a long time that often the companions will follow within 18 months. I have seen this with our cats, with friends cats and reading stories on other losses.
This often happens with human couples as well when they are senior. At least it happened with my grand parents and others I know. So I have learned to give a lot more attention to the remaining companion cats and try to keep them as busy as I can. I play with them more times through the day, I talk to them more, groom them more, sit with them more and give them a few more treats. My goal is to keep them occupied so they are not with as much free time to grieve, and as I always believed and that article said, they DO. They can become detached, quiet, call out for the missing companion a lot, search for the companion a lot, become lethargic and more. Sometimes the symptoms are not understood and no one realizes they are grieving and depressed. So give them all the attention you can. Show them you are not too upset and be there for them.
That is my advice, but I am just doing this from my experiences and I am sure others here will have better information and experiences they can share.
All that aside, I am so sorry! I will light a candle for ^Molly^. If you need to chat about your loss there are many people here who are happy to listen and offer you support. I am also always but an email away.
Sincerely,
David