First, I agree with most that have been said above, but would like to add a little something
Ever heard of one of most basic golden rule in life "Never trust anyone"? This applies anywhere, and usually can save you this kind of frustrations and pain. Trust is not given, it's something one's gain over time. So best is to be mature about it for your own good.
Also, besides all what people said...Yes cam models are publicly exposed to all kind of people, at different intimacy levels, and at first, until you get to know each other better, everybody is a stranger. Being a public figure, add to that the possible sexual and/or emotional involved, it can greatly escalade to all kind of disasters quite quickly. Even in real life, most people are often not careful enough.
AND... IF she is the one that opened up to you and made you discover reality was tinted previously, you should simply be grateful and feel privileged that she shared with you more personal things over time. Each model have boundaries as how much to share to the general public/strangers, and for safety reasons, this would require consistency, being a persona or twists on reality. No models owe anybody to expose their whole private life to the whole world. It's her choice and right as how much she share in the open, in a private setting, and when she feels comfortable to share deeper. You like the person for what she is, what she gives, or you don't. You can create strong long lasting bonds on a cam site, that will last forever. But ultimately, originally, it's not a dating site (even lots of them are ... well... You know). You entertain, socialize, have fun, build friendships, and then who knows. But nothing should be taken for granted, just like in real life.
And though no model owes anybody any explanation, there is many factors that would make a model do what she did.
1. She does her job, she is being kind, a pleaser, and do her best to make you feel good and relate with you.
2. The alternate reality doesn't make her not liking you nor make her an actual liar or manipulator.
3. Some models could've simply change studio and that usually forces them to change their name
4. She could've had a bad experience previously, either in personal life or online, and decided to restart fresh. Maybe was genuine before and would now be a kind of persona, or other around. Its irrelevant, the core of the person is the same.
5. It can happen that some models just wish a fresh start, reinvent themselves, because like anybody, we, humans, learn from mistakes, evolve, and change.
6. Working on multiple sites... well... who cares? when she is with you she is with you right? How does it change anything how she decides to handle her business to pay her bills? Are you wishing to be her full provider? Again, if a girl is able to be independent and not have to rely and be depending on others that could fail anytime for making a living, its a safer route and that just makes her a smarter and stronger woman.
Maybe learning some understanding an empathy wouldn't hurt. This goes both ways in any social and interpersonal context, no matter if it virtual or in real life.
Good luck