First, I WOULD let her breeder know... it is important for her to know this when making future breeding decisions. Second, it CAN happen even in "good families"
so just because she ended up with bowed legs doesn't mean that your breeder wasn't a "good breeder".
Not ALL bowed legs are caused by CD, and even if it IS CD, many dogs live long and healthy lives even with MUCH more crooked legs than hers look in these photos. CD is a RISK FACTOR for some health problems. That does NOT mean that it's a given that any particular dog will have all or ANY of those health problems!
There are no guarantees in life, with dogs or with people. You do your best, and hope for the best, and deal with what comes up. For now, if she is sound and healthy, don't worry about it, just enjoy her! You might, however, want to take her to someone who is knowledgeable about CD, just to confirm whether or not that's what is going on. That way, you can know what signs to watch for if other health problems WERE to crop up later.