I'm going to avoid my stinky niece
Why are you trying to avoid her though?
Because I'm a sensible person, I can't stand her smell anymore
That is your cute little niece. You should not avoid her just because she smells bad. Maybe you can help her so that she won't stink anymore.
She is not cute and why I should help her with her smell. I'm just trying to stay away from her.
It's insensitive to talk about babies in this way. It's normal for them stink. As I said you should clean her up so she won't stink.