She seems awfully ... perky for a deceased mother of 10.
There is a happy ending, however. The aforementioned creepy vagrant turns out to be Brock's absent father, Flint, who decides to be a dad again so Brock can leave behind his dependent siblings and travel the world with two preteens and their electric rat.
Now, here's the twist: The original creators of the show either didn't know or, far more likely, care what the American censors changed. So they eventually brought Brock's mother back. Rather than re-dub the character as a long-lost aunt or something, 4Kids just plowed ahead and hoped everyone had forgotten about Brock's dead mom. Something the twisted parallel universe American Brock probably wishes every single day.