I don't believe its agency ran. Her prices are ridiculously low for the content she provides compare to models who do operate with agencies. I've seen models charge $100 to $499 on Fansly just to get VIP for a month. On OF its usually models with free subscriptions who work with agencies and their shitty 2 min clips for $60 and non-nude pics . At least with Martha you get no PPV for a month when you purchase her $30 subscription. IMO her content alone is worth over $50-100 dollars (Would I like her to charge this much? HELL NAW), she's one of the few models who provides quality and quantity, super explicit. If anyone disagrees with my take just consider most models charge $30-$45 for 5 minute video and aren't even explicit, but Martha provide tons of long style content no PPV and are never recycled.
It's most likely she's burnt out, going through personally issues, taking a break or focusing on her studies. She's from Russia and a majority of models I follow have Russia geoblocked. In fact she has Russia blocked. Don't believe me, connect to a Russia server on ProtonVPN and try to load her profile. There's a probabilty her videos have been leaked in Russia and someone she knows personally saw her videos, it wouldn't suprise me if this was the case, but who knows just my dumb theory.
With that being said I wish she return. Easily worth every dime SHE'S A 1000/10. Her grip and squirts are ethereal. I would definitely subscribe to her if she returns even if her videos leak again. The least I can do is show support so that she can continue to provide content