Hi and welcome
I am very sorry for your loss.
Could you please add your country, state/province or UK county to location in your account details (accessed by clicking on your username on the top bar); this makes it appear with every post you make and will allow us to tailor any advice and recommendations to what is available and relevant where you are. We have members and enquiries from quite literally all over the world and from very different conditions, vet and rescue access, climates, medical brands etc., not helped this year by the ever changing pandemic conditions and limitations that vary considerably. Otherwise you will just get out general basic advice that is valid everywhere.
Please take the time to read these guide links here; you should find them very helpful:
- Looking After A Bereaved Guinea Pig (what you can do in the immediate to medium term for a bereaved piggy)
- Single Guinea Pigs - Challenges and Responsibilities (includes a chapter on the special challenges you face with a bereaved single as well as a chapter on companionship options and how lack of species interaction can come out when social needs are transferred onto you)
- Rescue Locator (link to recommended good welfare standard rescues in some other countries below UK map)
- Bonding and Interaction: Illustrated social behaviours and bonding dynamics
You can look at sows or neutered boars of any age - the crucial bit is mutual liking and character compatibility so if you can allow your daughter to have a say in who she wants to be with (like in rescue dating), it is well worth the wait. Otherwise you have to have a plan B ready to implement in case acceptance of your own chosen partner doesn't come off (neighbouring cage with interaction through the bars).
PS: Here is some support for your own grieving process:
Human Bereavement: Grieving, Coping and Support Links for Guinea Pig Owners and Their Children