Hi!
I am very sorry for your loss! You are welcome to post a tribute to Coco if and at whatever point it feels right for you. The Rainbow Bridge section is there for those who would like to make use of it.
Here is help for your own grieving process:
Human Bereavement: Grieving, Coping and Support Links for Guinea Pig Owners and Their Children
Guinea pig noises may help her not feeling so alone. Please be aware that guinea pig communication is very complex - apart from the sounds, guinea pigs communicate by body language and by a sense that is much finer than ours - smell/pheromones.
If you could bring her into the part of the house were you are most in, then that may also help.
As long as she is eating/drinking, please give her a few days to grieve and ideally find her a rescue date within 1-4 weeks to allow her to choose her next mate and to be sure that acceptance has happened before bringing a new companion home. It will give you peace of mind and you generally get a good relationship out of it as mutual liking and character compatibility are the key to any successful piggy bond, long before age or gender (sow or neutered boar).
Looking After a Bereaved Guinea Pig
Recommended Guinea Pig Rescues