I shouldn't be worried about this right?

I have a paint mare that is 15.2 Hands. I plan on breeding her next year to a huntseat stallion. Since most quarter horse and paint huntseat horses are large I was just wondering if the foal was large would it hurt her at all? I don't think it would but I want your opinions to keep my horse safe. She is built well and pretty muscular. Some of the studs are 17+ hands. Any suggestions or opinions?