She is about 6 years old. Where she is she is at a barn with a 26 year old mix I will have pics of him up here later to see if anyone knows what he could be, my morgan QH cross gelding who is 6 and two retired tb racehorses, one has cushings he is 28 and one has a class 6 heart murmur he is 34...these are horses no one else wants and the woman will keep them all until the pass.
One way to help the mare get exersize would be to put her on a track. Think a long narrow (25ft) paddock. A full circle is best but a straight one can work well too. Put her hay along the track and she'll have to wander to eat, come back and get water, and go out again to eat.
My horses require pasture but I have four of them, two I seperated by placing a "track" along the back of the third. So if they want to go to the other pasture they have to all the way down and around pasture two. When they want water they have to come all the way back again. I have small hills which help too. If I can't ride I want my girls to get exercised. They seem quite happy and are in good shape.