She is a lovely piggy, looks like she is a Cream and White Dutch, but very mismarked.
Like the others have said I personally would not recommend keeping her in an Aquarium, they are not the best cages for Guinea Pigs, like you have said previous, this is only a temporary cage.
Here are a few examples of cages I would recommend....
This cage can be made very cheaply, visit the website:
Cavy Cages
I would not recommend a cage with a mesh bottom, this could damaged your Guinea Pigs feet. I wouldn't recommend using a ball for her either, this can damage their backs. Guinea Pigs bodies are not like hamsters or chinchillas.
Have you thought about getting another sow (female) to live with her? Guinea Pig are very social animals, I currently have a small herd of 5 living together, they have there squabbles but who doesn't?
Any questions, I am here to help, I have kept guinea pigs for 7yrs now and I am currently the mammy to 16 lovely pigs!
Emma x