Domesticated Nutria Rat? Update: She confessed! Xmas card pic in OP

So, last night I go pick up my little sister (12, no pics) for Christmas dinner with the grandparents. Talking on the way, she starts telling me about these "cute" nutria rats in the backfield (basically a big pond and wooded area) of the neighborhood. Being a big brother, I casually make the remark that she ought be careful around them because they can be aggressive and she wont be as pretty with a couple of missing fingers.

So this is where it takes a turn. Her response was "don't worry! they don't bite!" which obviously confused me. I said sure they do but she insisted. So I asked how she knows they don't bite; she goes flush red and starts acting really guilty. Then she starts making me promise not tell my parents whatever it is that she is about to tell me. Now I cant help but laugh because knowing her, it could be anything.

Sure enough, she goes on to tell me that she found a furless baby nutria away from the pond. She "thought it was dead so she had to try to resuscitate it" (which she did, and yes she used that word and I have no clue how she knows that word ). She then goes on to tell me that she's been feeding it carrots, grapes, milk from a bottle, etc.

At this point I'm extremely skeptical but still doubled over with laughter. I ask how long she had been mothering this rat - "4 weeks." I ask if he has a name - "Tandon". I say how do you know its a "he" - "I googled it and he has a little...". Now I'm almost crying laughing and thinking "oh shite shes being dead serious" at the same time. Then she says she googled "Nutria Rats as pets" and nothing came up.

Well, then it hits me that she cannot be nurturing a baby rat out in its natural habitat which means...
"So where in the world are you keeping this thing?"
her response: "It lives in my dresser"
I literally almost wrecked my truck. She goes on to tell me that they take him back to the pond almost every day to play. She said they have even tried to release him a couple of times but he just swims right back to her and her friend. AND she swears she even trained him to use the bathroom on something called a potty pad. Since we were headed to eat, I asked her where he was right now - "Oh, Mallory said she would keep him tonight"

So, needless to say, my sister just let me in on the biggest family secret to date: there is a 5-week old nutria rat living in her dresser drawer and my parents have no idea. But I promised not to tell because there's no way I can break her trust. And I kinda want to see how this plays out.

Sorry for the wall of text but I had to share this. Has anyone else ever had a pet nutria rat? Is this a thing? Or did my 12 yo sister just tap into a new market? And serious question, is it dangerous? I don't think it would be impossible to domesticate one, but I honestly have no idea.

TLDR: My 12 yo sister saved a newborn baby nutria rat's life. She has been mothering it for a month, while it lives in her dresser. My parents have no clue.

Merry Christmas, OT!

UPDATE: At my parents now. Sister just sent me this pic.

She's feeding it fruit smoothie through a syringe

Also, for clarification purposes, she sent me this picture, which explains the name. I seriously cannot stop laughing. My parents are clueless.

Moar pics on page 5!

Update: She confessed!