I am a former notary, not in the OP's state but in one of the states that borders the OP's (we don't know which state she is referring to).
Only a MA notary can witness documents in MA, and a MA notary can only witness documents in MA. The same is true in NY.
One of the requirements of being a notary in both states is that you be a legal resident or maintain a business office in which one regularly conducts business. Most if not all states have similar requirements.
So yes, it is possible that someone could live in one state and be a notary in a diifferent one. However, I have not found any suggestion that it is possible to be a notary in more than one state. I think it would be extremely hard to qualify for multiple notary licenses unless one lived in one state and conducted most if not all of their business in a different one.
And truly, the answer to this question is something the OP really should have known, if she actually is a notary.