Yes, this is an amateur attempt at film making but it would not so significant if one doesn't look past the dubbing and obvious foibles from the production. I watched this in a Native American Film class and from there I know that this was Arlene Bowman's first attempt at making a real film. She originally set out to show her grandmother's day to day life but came away with something completely different.
They are both Navajo but two people - even related - can't be so different. Arlene doesn't know anything about her grandmother's culture or language. The Navajo have taboos about being filmed in any way. The conflict here is about an essentially "white" Indian trying to make a project for herself (bringing nothing to offer to her grandmother in return) and a "real" Indian sticking to her traditions and her culture.
To put it simply, the film is all about the ethics of documentary film making in the worst way possible. But the message - the significance - is still there.