Assuming the rental is in seattle as OP is,   Seattle has an (annoying but its the law)  ordinance https://www.seattle.gov/civilrights/civil-rights/fair-housing/first-in-time dictating how rental applications must be processed -  This is the first-in-time ordinance.   

The market dictates pricing so simply check to see what comparable properties to yours are currently renting at and then notify your tenants that the rent will be $x beginning on (date) and a new lease will be needed. 

so choosing the right cash flow property to begin with is key. and quality of asset usually will dictate consistent rental income. 

How in the world can they claim there is mold then dictate when and how it will be remediated while you provide alternative rooming... and now they want A-Z... consult an attorney and get out of this situation ASAP.

I've let tenants dictate terms too much and that stops now.I've had to learn my lessons the hard way in this business.

That would also dictate what you need to do.

The bigger point is allowing the tenant to dictate improvements on your property.

The other tenant (a new tenant) will have a lease that dictates they pay 1/8 of the water bill.  

Be prepared to file the eviction within 3 days of the lease's expiration date (or whatever your lease and state laws dictate), and do not accept any money from her after the eviction is filed. 

I rule like a dictator but I'm also very friendly and very fair and have attracted great tenants because of this style.