This fawn saw two does eating grass and wanted to join them. One doe touched the nose of the fawn; that is one of the ways that the deer remembers other deer is by the scent that they put off.
The doe decided that she didn’t want the fawn to join them, so she started to chase the fawn away. The fawn's mother saw what was happening and came running to protect her young one. The mother deer chased the other doe out of the yard.
The doe wouldn't have hurt the fawn, it just didn't wanted the fawn near her.