I don't know if it's proper or not for a mom to host a shower. I've really never give it much thought to who was hosting it and have been to showers hosted by moms, sisters, aunts, friends, gmas, godparents, mil, etc.
I think the focus is on the guest of honor and it doesn't matter who is throwing it. If you really just don't want to go, then don't. You don't need to have a reason...
