Two people on lease one has moved out, what now?

[Ryan Spath]

BP community- I received an email from a tenant at one of our SFH that things with her relationship have reached a point that she can no longer live with the person. She informed me that she has moved out of the property and wants to meet to give me her garage door opener and set of keys etc. I called the tenant and we had a conversation and she understands she is legally bound to the lease, she is also aware of the clause in the lease that states should the lease be broken there will be a financial penalty. She says the other party has the intention of remaining in the residence, and she would guess he would intend on moving a room-mate in.

I have a call schedule tomorrow morning with the other party that is on the lease.

After speaking to the other party and understanding his intentions assuming he intends to stay do I make any amendment to the lease releasing her of liability? Do I just lease the lease alone and conduct business as usual? 

She mentioned he would want to have a 3rd party move in which would of course be subject to an approval process. If this is in fact the intention do I simply terminate the current lease and create a new one? If so do I increase the rent to the current market rent?

They signed an 18 month lease with 12 months remaining. Based on my research for comparable properties using rentometer, hotpads, and craigslist this property would easily rent for $150-$200 more a month due to the current demand.

Not really sure how to go about this one and any experience or advice is really appreciated.

Thank you!