
Hi Emma,
All bitches are different - just like their human counterparts ;) She may or may not bleed through the entire duration of her season and she may be in season for up to as much as 28 days - so vigilance is paramount for almost an entire month from a possibe accidental mating perspective as well as a cleaning one.
I've found my girls to be exceptionally good at keeping themselves fresh but your girl may not be quite as on top of things. If you have a large mat / rug which is easily cleaned or alternatively buy a cheap off-cut of carpet to put down in her favourite place(s) where she lies this will greatly reduce your cleaning up time and prevent staining to permanent flooring. For furniture just some old bath towels or a cheap throw over blanket are useful and of course easily washed.
As you don't want to breed from her it is a wise precaution to have her neutered 6-12 weeks after her season is completely finished and then you won't find yourself in this position again.
HTH, regards, Teri :)