Is it disheartening when someone doesn't even acknowledge a gift they received from you?

I bought an owl-themed shower curtain for a family member who is into owls. It was sort of a combination baby-shower gift and belated Christmas gift (I didn’t get it in the mail until the end of January.) I gave it to her mother to give to her over a week ago, and I haven’t heard a word. Kind of a bummer. I’m not angry, but it does leave me shaking my head. I mean, this is an adult.

How do you feel when someone doesn’t say anything at all about a gift you give them?