My DD and I have just had an 8 guinea-pig cycle lasting eight years (lots of overlap, at one stage we had 5 of them)
DD was 9yo when she wanted "a pet" . I had guinea-pigs when I was 9-22yo , so I wanted them too.
And that's the crux. No matter how she says she wants them, will feed them, play with them . Even if she does you will get a lot of the work. My DD and I shared because half the pigs were mine. But if she was ill, away , a load of homework, I did it . It's just as quick to feed and clean all of them. But if she said "Mum can you do the pigs tonight" then she knew she was on duty next day .
As the adult it's down to you .
They are lovely , but so messy . The hay smells , and gets everywhere .
Ours had a Pighouse (converyed wooden playhouse) and in winter had big cages in the small bedroom. They need a lot of space .
And my DD allergic to GP3 and GP6 (red itchy rashes) .
They have very specific health needs . They go from Well-to-Dead before your eyes and you have to catch illness quickly .
Our last pig had an eye ulcer , I thought she'd have to lose the eye but 4 weeks of drops and gel, she recovered . Saw the Vet on the Friday given the all-clear . Died in her sleep on the Sunday !
You cannot keep them alone but you get to the stage when you don't want to add more . We had three oldies but over 6 months they all passed .
I was in a pet shop a while ago, there was a child wanting "a guinea pig" , the Dad was "oh I'll get you one" half hearted .
I had a quiet word with the Mum about the work involved ,( and there's no !A GP , you need 2 ) I was out at 6.30 sorting their shed to do a safe transfer (they cannot go from warm to cold) . Ours had dry fresh room temperature hay every morning. We took out the dirty bedding at night when they came in.
They had a little heater on 30 minutes before to take the chill off .
You need to store hay and the dirty beddiing .
Loads of newspaper .
I think she realised she would be doing it and didn;t buy a piggie .
My NDN used to keep hamsters , she bred some and had some given/rehomed to her . She said they were lovely .