She may just spot a little, my youngest GSD gushed! I kid you not, then looked up at me as if to say, 'clean that up would you' (spayed now thankfully) whereas my other bitches were hardly noticeable, it isn't just breeds that can be different but individual bitches, the time that they bleed for, again can vary, my dog bled for the full 3 weeks in varying degrees, some only bleed for a few days, but as it is your bitches first season they generally aren't as intense as subsequent seasons so you may be lucky.