You will get very many different ideas on how much space should be allotted per mousie. Some folks would only say two or three meeces in a 10 gallons tank, and others, like myself will say anywhere from 6 to 12 depending on the age, the sex and the relatedness of the meeces.
The surface space in a tank can be increased, in any case, by the use of platforms, wheels and suchlike.
Personally, I think those who insist on a lot of space per mousie are operating out of sentiment, not reality. Even in a ten gallon tank with 8 mousies in it, they will usually be found all piled up together in a corner. For someone who keeps a mousie or two, sure, give them a lot of spce if you want to, but I don't think it's a requirement.
In any case, it would be cruel to keep just one doe, as they are social animals. Two in that cage would be better than one.
The surface space in a tank can be increased, in any case, by the use of platforms, wheels and suchlike.
Personally, I think those who insist on a lot of space per mousie are operating out of sentiment, not reality. Even in a ten gallon tank with 8 mousies in it, they will usually be found all piled up together in a corner. For someone who keeps a mousie or two, sure, give them a lot of spce if you want to, but I don't think it's a requirement.
In any case, it would be cruel to keep just one doe, as they are social animals. Two in that cage would be better than one.