Tenant's Issue with Washer & Dryer

[Vanessa S.]

I have had a loyal tenant (tenant A) of 17 years who rents one of the rooms of my rental house. She had not given me any issues until now and it involves usage of the washer and dryer. Tenant A doesn't get along with Tenant B who rents another room in the same house & she refuses to talk to B.  

This is where problems arise...today, Tenant A texts me that B left his wet clothes in the washer and today was the only day she could do laundry. (Troubling, already...) She informed me that I needed to tell B to remove his clothes so she could do laundry. 

I refuse to be the intermediary for these tenants as they are adults! Instead of her trying to communicate with B about the lingering laundry (like a normal & civil human being), she then texts me she will do her laundry off-site and deduct the cost from next month's rent. 

This is where my question stems- is this even legal? She technically has 24x7 access to the washer and dryer. Just because it is unavailable for a few hours due to another tenant's delay, does that justify deducting the cost of laundry from her rent check? 

Thanks in advance. I am frustrated at how extreme tenants can get and how drama can ensue between them...

Thoughts?

[Gail K.]

Don't you hate it when you rent to adults and they turn out to be children?

While it's understandable that tenant A, having lived there for 17 years, may be under the misguided illusion she, somehow, has more "rights" in the matter, inform her that failure to pay her entire stated rent will result in initiation of an eviction (or whatever your particular term is for this).

Time to nip this nonsense in the bud so to speak.

Gail