First of all, JR, do you have a rental agreement, in writing, between the two of you?

Second, did you have your roommate SERVED with the necessary notice to QUIT? ( By an independent process server, or at least someone other than yourself?)

If you DO change the locks, without undergoing legal due process, SHE will be the one with legal grounds - probably - to have the Sheriff pay YOU a visit, to retrieve a key - for her - to the new locks.

As you might suspect, it's NOT as easy to get OUT, as it was to get INTO the situation, and you'd best step carefully, and dare I add, cordially, because she probably DOES have some rights, if she chooses to enforce them.

Good luck.

do a formal eviction if needed. You can not lock her out if she is documented as a resident of the home. Examples of documented would be that she receives mail and that the address of your home is on her drivers license or other official documents!

A call to your local police dept might get you an answer or suggestion where to go for one.
If it's your house I think you can change the lock anytime you feel the need, but restricting her things and access might be a problem.

AH, young love.
Realtors will not give you LEGAL advice and none of us are qualified to give you LOVE advice.

Good luck and may God bless