I was wonderin since theres a roman atremis dose she have roman hunters

Yes The Roman form of Artemis has Hunters

I think that all her hunters are either greek or roman and could not tell anyone about the other type of demigods.

I'd say no, because it would be hard to keep that a secter from like Thalia and Zoe

Maybe, it could be because gods and goddesses can be at many places at once!

its possible because the Romans had some differences from Greeks not just names of the Gods. Like the Romans praised Mars(Ares god of war) more than Jupiter(Zeus) in ancient times because of their warlike beliefs. So who knows maybe its different for Roman Artemis

I'm not so sure because the hunters of artemis are made up by Rick Riordan so anythings fair game but im sorry to announce that there are no real hunters of artemis in greek mythology

The Hunters reflect the Vestal Virgins of Ancient Rome and it is possible that they are to be their Roman counterpart.