Charged with theft for ordering online as a minor?

Location: Canada, BC.

Okay, so, for context, I ordered on temu a week or so ago using a Joker temporary visa. I am underage, and have a very strict/bordering abusive grandmother that I live with. I am not able to use the money I make from work, online or in person, which is partly why I’m so sceptical of her claims since she is most likely just pissed about that.

So, I haven’t gotten the package yet, but it was cleared by customs and I only spent 3$ on it, 10 for the card. My grandma is claiming that I broke the law because I can’t agree to terms of service as a minor, and that she is going to be hit with a charge of theft under 5’000$ because of that. Now, temu does not know my name, credit card information, age, anything, and it’s very unlikely that a big company is going around sueing people for the sake of it. I also couldn’t find anything even about that, other than it is indeed true that minors can’t agree to terms of service—but that doesn’t automatically mean that ordering something as a minor constitutes to theft.

So, well, I guess that is my question regarding that. My gramma also believes that America will use my information to.. use my card? Which has like 4 dollars left on it? I don’t know. She thinks they can ‘charge it back’ like they can create money out of nowhere to steal from us.

Also, I’m aware China owns temu. She is the one claiming America is the one stockpiling information—which, maybe they are, but it’s definitely paranoid thinking.

Also, perhaps some sources would be nice, just to show her and get her off my case, whether true or not?