Usually with osteoporosis, one of the (many) aspects that's good to work on is stability, such as gait training, dorsi- and plantar-flexion exercises, lateral stability, good ankle/knee/hip control, flexibility....because first and foremost, you want to try and head off falls that may lead to dangerous breaks and fractures.
Immobility can lead to calcium being leached out of the bones as well, so couch potatoes make the situation worse.
Bone density and
muscle building, ohhhh absolutely totally without a doubt, big time important. No heavy impact is required, but weight bearing is good along with resistance. Modifications are usually made however, between certain movements being okay or not okay depending on bone loss.
Calcium intake is important. The body can only absorb roughly 500mg's at one time (and needs vit-d, boron, phosphorous, magnesium, etc., for good absorption).
Walking is really good, because it works with foot flexion as well as impact and helps with pelvic mobility.
Making it fun by doing tests which work on her abilities to navigate courses, balance, move up and down, etc., might make some of this seem less like exercise and more like just....fun stuff.
:confused: 
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