I have to agree that your grandma is cooler than mine! Mine was quite oring other than the fact when she was this young, she used to have diamonds in her shoes and had golden and silver tea sets... well the glory days are over
Although you didn't take the photo and so a critique over the work does not apply on you, i will comment on it as a photo. The pose, composition and resolution for its time is good with the sky bright behind her and the bottom borders of the work feeling hazy. Over all I like the work but I am not that good a critic on photography.
The one I have is the old tin type photo, that in and of itself is pretty neat, but it was just so much rarer back then to have your picture taken, seems like they pulled out all the stops to make each click worthwhile back then perhaps