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Is there something wrong with my sister's Guinea Pig?

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Basically my sister and I have a Guinea Pig each, they are both 2 years old and will be 3 in August. Quite recently we've noticed that my sister's Guinea Pig is a lot larger around the stomach area particually on one side. I have gently felt around the area and is does feel quite large. My Guinea however, has a much more equal body size and appears healthy. I know Guinea Pigs are supposed to get bigger throughout life and thinner when they get older, but is the size of my sister's Guinea Pig normal? We are not breeders and they haven't been near any male Guinea Pigs, so there is no way that she is pregnant? Could it be a tumour? I do hope not. Her behaviour is normal and she is active, and they both receive a health diet daily. If you have any ideas of what might be wrong then please help. Im not majorly worried but it has just grasped my attention.