First, congratulations! Keikis are wonderful gifts from our plants.
I'm going a third direction (in the third response). I'd leave the spikes on the Mother but cut the spike from the keiki. Each spike takes about the same amount of energy to develop as does a leaf. That's fine as the Mother is nice and healthy. But the keiki needs the energy for roots and leaves right now, which are going to be a secondary thing while it tries to spike.
As others have said, it needs enough root to survive on its own. 3-4 inches is a minimum. Letting it get a little more is fine.
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