Mid-50's, won't be more specific for privacy reasons. Her age really makes her Instagram "career" even more of an Eyerolling cringe since it comes across as "How do you do Fellow Kids?" at best.
You know when I was reading the OP I was under the impression that the person was young around 18-25 years, not someone in her mid 50s. She's clearly deluded and think that she can get rich quick via Instagram.
I am sorry to say but other than taking away access to her account, she's determined to ruin herself which in turn is going to ruin you and she's clearly not listening to reason.
You have four option;
- Bail out,
- pretend to be the scammer and take the money and show her that she was being scammed,
- find a way to take control of the rent money.
- do nothing,
...why does someone with an anime avatar have a 50 year old roommate?
Because the animé character is 50 years old but just looks young.