You may want to read the 'Inapporpriate Peeing' sticky at the top of this page! There can be a number of factors as to why a cat will do this!
You should take her to the vets to rule out any health issues, as it could be Cystitis or a UTI and she's just trying her best to let you know!
You will also need to use an enzyme removing cleaner to clean the area where she has been peeing.
But please do visit your vet to rule out health issues, primarily!