Tenant asking for house to be cleaned

[Mike Huggins]

8 months ago a new tenant joined two existing tenants in one house.  All three are on the lease.

Today this tenant says, "since you are raising rent $100 on the renewal coming up could you pay for someone to clean the house.  It was very dirty when she moved in she states". Other Tenants say it was clean as I am collecting information from them.

I have asked to talk with her to understand what needs to be cleaned.  

Should I have the house cleaned at my expense ($300-400) even though she has been living there 8 months?  Why didn't she bring this to my attention on move in?

I think this may be a roommate issue.  As in, not everyone is doing their part to keep the house clean.