Would it be dangerous/irresponsible to breed my small border collie ***** with a large siberian husky?

My beautiful short hair collie has come onto heat for the second time, and when she next comes on (which should be in about 6-7months) i was hoping to breed her. First off, do you think this is too young for a dog? Iv been told border collies stay playful right up untill ripe old age, so is it true that it changes there moood? i love ellie as she is and dont want becoming a mommy to change her, but i think she would be a wonderful mother and i was hoping to breed her with a siberian husky, as my husband best friend has a handsome one whos 16months and very eager!! I know quite alot about pure breeding as my mom did it with her lakeland terrier (breeding a couple of times changed her to a grump old sod(although it could of been age), which is why i asked about wether it changes their temperment) but i dont know much about mix breeding apart from its pretty much pot luck what characteristics you get! I would not want to endager Ellie as she is my best friend but i would love to keep one of her puppies, as she has a bit of fear-aggresion so she "finds it hard to make friends" haha, so if it was one of her own im sure they could be friends as she is lovely to dogs she knows well. anyways LONG STORY SHORT will breeding a small/medium border collie with medium to large husky hurt her/would she be able to give birth naturally?, and would she be at any risk? i mean i would love her to have a friend but i would never do anything that would put her at risk and i can always stick to breeding with longer haired collies, as she is an incredible working sheep dog. its just think borders and huskys are the cutest mixes...i also think i could handle the stubbourness and having a bit of collie would help obedience maybe? or just make a very clever naghty dog! lol. would REALLY appreicate any input, even if it is just general breeding small/large dogs. thanks :) beckkyyyyyyxxxx