Problem With Angel

[9inchpleco]

I am having a problem with my 3yr old female angel.
For about a month now she is constantly laying on her side.
Otherwise she seems normal. responsive, and eating well.
It breaks my heart to see her this way. I cannot figure it out.
All her fins apear normal also. Does anyone have a clue as to what could be wrong?

 

[waterdrop]

I'd post this to the emergency section, not so much because its an emergency but because some of the members who frequent that section could probably explain it best. Perhaps its a swim bladder problem - there may be nothing to be done.