This person is not your "landlord". She is a tenent in said property, and you are a subleaser.
Even if you do not have a writen lease, the State where you live probably has basic laws pertaining to housing codes, what is required by a landlord and what is required of the tenent, etc. If you live in a rental property, you have basic housing rights, and as a verbal agreement lease-ee, or even a long term guest, most states consider that your residence.
As to the "verbal"? The fact that the utilities are in your name, gives reasonable cause to believe that there was some agreement.
I believe you can prove you were malisiously tricked by this roommate, and scammed out of being on the lease.
The party who dishonours a verbal agreement may have acted in a way which could amount to an irrefutable presumption that the agreement had taken place. Small claims/housing court judges do not require "proof beyond a resonable doubt" like criminal court, but your proof, story, evidence, etc would have to be a more believable one than hers.
So start making notes (keep journal with dates, and time of day) as to every threat, etc, and perhaps make some DISCREET recording of "argeements" or threats.
Don't forget about a RESTRAINING ORDER. If you feel that you are been harrassed, go to your town hall or whatever you have where you live, or the cops and ask them where you may obtain a restraining order for someone you live with who has been making your life very uncomfortable. In some cases, if the restraining order is a 'civil" (as in civil as aposed to criminal court) in your state, there may be a fee of up to $150.00 However if you are at a fiscal point in your life where you are netting below a certin level income, you may be able to ask the clerk about how the fee may be waived. Do not make up stories regarding the details of the harrassment, because liying to the police, etc, can get you in hot water legally.
Once you have a restraining order (if it's criminal), your tricky little friend will be required to leave the apartment, "to satisfy you". (If R.O. is civil,) you may use it as part of your case to defend yourslf against further threats, etc.
It is not difficult to search "landlord tenant laws Rhode Island" (or what ever State) online. Usually the State's "tenent's handbook" or some such thing out lining the laws will be downloadable in PDF format, where you can print it out and read it over very carefully.
believe me, it is a cool feeling to become INFORMED!!
Even though you are going through an emotional time right now, try to stay clam, and remeber that your safety and health and well being must be your priority in situations like the one you're in now. Take the time to do things right. Always jot down any agreements made right then and there, and have the other person sign it, and than you may sign it as well. This goes for the L.L., your roommate, or anyone. If they are not intending to be deceitful, they should have NO problems, writing their intentions on paper.
You can keep a note book or journal of any threats, and or agreements, and make sure each entry is dated, and the time of day is noted. Make sure your roomate doesn't have access to this journal. Putting a lock on your door (home depoet), and locking it, and keeping the key on you at all times is a good idea as there is no telling what your roommate might be cable of in terms of deceit.
Last tip. Scrub duck butts for a living as your night job, but what ever you do, pay your rent. Pay your rent to the actual landlord (money talks). ALWAYS GET RECIEPTS and NEVER EVER EVER PAY CASH. Use a postal money order if you have to, they only cost a buck, and your piece of mind is worth .99 cents plus a penny. Right?
P.S. Your "friendship" is over. Take care of yourself.
Good luck!