Plus I really doubt that even if Father would not kill her for taking Alfred body she will try it anyways, simply because our body is not useful for her, and I doubt that Dante, an Alchemist that has been living for 400 and is an expert in philosopher stones, doesn't know that... Any benefits of having done human transmutation are linked to the soul of the alchemist, not the body (just take a look at Alphonse, Father needed to wait until his soul came back to open the Gate), so taking over our body will only gave her the body of a 15 year of mute boy (not precisely prime material for a body swapper), not any of the cool shit that those who have opened the Gate of the Truth gain, like Alchemy without circles.