I can approve this with an alteration: She can create vampires from non-numbered that way, but they will not yet share her physical enhancements. She'll have to regain the ability to pass on physical enhancements at the same pace at which she gained them for herself - to be able to pass on ability X that she gained through a tier one echo, she'll have to get a tier one echo for "passing on ability X".

Does this work for you?