How do i bring this up gentley?

Cori • Preggy with baby #1!!
So my mother in law has started going crazy buying things for the baby. This is her first grandson so I understand her excitement however she is just buying ANYTHING like she bought me a bath tub, a crib mattress (which is wayyy to soft) and a couple of packs of target brand diapers to name a few things. And it's not that I'm not grateful its just she's not looking on my registry even tho every time she hands me a new "present" I ask her (trying to hint) if its off the registry. I did a lot of research to put the items I picked on my registry and she always says no but look how cute this one is! She is also getting things for Hus nursey even tho she knows the theme. For example she got him this like 3 foot tall stuffed elephant... His theme is superheros. I don't want to come off as ungreatful because my husband and I appreciate all the help we can get but I just wish she would look at the registery and also wait till after the shower. So I know after that what I really need. How can I talk to her about this without coming off ungreatful