[Cherie]

Get your Mum to approach the daughter first, it's a tricky situation as the daughter may be under alot of stress and trying to keep her Mum "at home", and may not want to engage about this, but you need to do something for your own peace of mind, is the dog elderly, is it exercised, you could maybe offer to walk the dog (if you have time) and build a picture of how the dog is treated generally as well, you will know if the dog is nervy or jumpy around the owner.