Weddingbee boards

My mother's asked me for some recommendations for workout DVDs she can do at home. We've got p90x and Jillian Michaels, but they are both too difficult/hard core for what she needs. She's 52, not in great shape but perfectly mobile. Her exercise is pretty gentle, she walks a bit and occasionally takes a dancing or tai chi class (but never sticks with it for very long). She is asthmatic and has a fear of getting breathless (even though I've tried to tell her that my asthma is 100% improved since exercising regularly). She doesn't really believe in breaking a sweat. But I have been worried about her, she eats well and is very happy and hardly ever gets sick which is great - on the other hand, she keeps putting on weight (I think that's normal for her age) and her own mother needed a hip replacement last year (which she probably wouldn't have needed if she'd lost weight). So, I want to encourage her to move! She likes music and dancing so something that includes those would be ideal, but something geared towards an older lady would be best (although not too old - she's not 90). I'm hoping some of the bees might know of a good workout, maybe one your own mothers have used or that you have seen in shops? Any ideas?