It sounds to me like she is in heat if she has not been spayed. Is your goal to breed her? If not, you must take immediate action to keep her completely away from all male dogs.....the fact that they have not mounted her yet probably means that she is "not quite" ready, but that will change any minute. You are very likely to end up with a batch of puppies shortly. Only the best representatives of the breed should be allowed to breed, and even then, it requires an awful lot of work, and expense. Dogs make much better pets when they are spayed, and it is so important to try & cut down on the number of unwanted dogs who end up in animal shelters.