Rodent Question Please Help me!?

 
Rodent Question Please Help me!?
Okay so I have 3 mice all girls 2 of them were born on March 31...and I have a COMPLETELY black mouse (FEMALE!) She is SO fat she is about as big as my hand! She isn't a rat but she is a mouse and she only about 8 or 9 months old I have never had a mouse like this! She has almost always been this way! She doesn't exercise at all well...maybe about 3 minutes a day!


So my question is why is she this way! And what can I do to have her loose weight? SHE IS NOT PREGNANT! And I have a wheel in her cage but she only used it for like 3 minutes a day! She hates to run around! So my question is WHy, WHy Why!
answer:
This is NOT an answer. This is a question. Why did you post the same question 5 times, but with different titles?