I can sort of see where she is coming from, if I was selling Chi puppies, I would put on the ad not to be homed with large dogs or small children. When the prospective owner is sensible and experienced however, I wouldn't have any qualms about big dogs or kids, but for the general public, it would still be a no-no.
Your breeder cannot change her mind now, end of. He belongs to you, and it is no longer any of her business what you do with him. If she wanted a say in how he is raised, she should have had you sign a contract.
I bet she has had someone offer more money than you paid for him, and she is just seeing pound signs. Ignore her.
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