Perhaps MIL was afraid something bad would happen and having alto of gifts around would be a sad reminder for the DIL.
Chigger, you are exactly right. NO ONE was trying to give the mom to be a "slap in the face" by not having a shower for her before the baby was born. But having a houseful of gifts and no baby would be a tragedy, so MIL told SIL right off the bat that the shower would be after the baby was born (also, that way people could give gender-appropriate gifts).
The point of my post was that the MTB wanted HERSELF, not the baby, to be the focus of the shower, which is why she had her own shower before the baby was born. She didn't want to be passing the baby around and not have people not pay attention to her. We all held our breath for a healthy delivery, which she had!
Sorry if I didn't make that clear initially. This woman is a true entitlement princess and could have her own category!