I agree, you need to bring her inside. Like mentioned, male dogs can smell her from literally miles away, they will jump fences, break through windows, they will do anything they can to get to her. And she shoud NOT be having any puppies until she is AT least 2 years of age. BUT if you can not better the breed then please do not breed her at all.

Have you tried special doggy diapers? They stay on better than regular ones. Or even human underwear with a maxi pad in them? Tie a towel around her? Try anything you can just get her inside please.

She will be able to be spayed within a couple weeks after she comes out of heat. And many shelters & the like offer reduced costs for it.