My Malamute Pup, 4 months old

Someone help me! My mal's a beauty, her name is Desna... but I am having
interesting problems with her. I live w/my sister and nieces, so I can set the
stage here. Desna has no problem listening, understanding and has no accidents
when its me and her alone in the house. None, I can make her crazy even after
downing her food and water and she waits until her normal time to go out. Add
anyone else to the household and she forgets. Even as far as peeing in her
crate today. She seems to be agressive towards my 7 year old niece. (I think
she senses the agression of my niece) Yet with a baby she's gentle as can be.
Yeah I know I can move and the problem would be resolved, or would it? Ideas on
this would be great. I have to keep her crated when there's other household
members in the house cause she won't conform unless I am in the same room with
her watching her every move.

Other concern or maybe I am just a worry wort... She can inhale her cup of food
in less than 10 seconds. I feed her 3 times a day and i tell you, she acts like
she's starving. She doesn't even chew it, just swallows the kibble whole. I
have tried everything to slow her down. But she gets this crazy behavior about
her during feeding time and it worries me. I worry that she could develop GDV
eating so fast, she gets super bloated after eating like that. And serious
hiccups! Wet food is a mess and she becomes even more agressive w/that.