I’ve known a few people who did this now and then, in a cutesy kind of way; for example, “Tonya has to toddle off now. It’s her bedtime.” I thought they were imitating Mommyspeak, which positively makes me gag.
Does Terry by any chance have small children? Or maybe they’re grown and she still speaks to them like this: “No, sweetheart, Mommy doesn’t want you to do that. Mommy wants you to pick up your toys now. Do you want Mommy to read to you? Here, Mommy will give you a cookie. Give Mommy a kiss.” What kind of model is that? What in the world is wrong with a mother’s saying “I”? How does she expect her kids to speak about themselves when they’re learning from her?
Maybe little Terry learned to talk from one of those Mommies and grew up saying “Tewwy wants a cookie. Tewwy wuvs Mommy. Tewwy gots an owie.” Now it’s “Terry has a meeting in fifteen minutes. Terry is going to get some coffee. Terry has an appointment with her shrink.”
Bad Terry. Terry gets a timeout. Terry shuts up now.