I mean this is in no way canon yet, so I could be wrong, but It seems like they are tip toeing around something about Rose being not so nice.

I mean since it's a kid show and she's the main character's mom I'm sure it'll also be resolved/redeemed by this point in canon. Steven will find out about it, grapple with his feelings and then have a long talk woth greg/pearl/connie/lion/whatever. But I mean she did likely come here as the invading alien leader from a civilization that's been shown as not so nice, before they rebelled.