I have a cousin whose daughter was like this and my suggestion is that you pay attention to how you're responding to her. For example, she would point at something and just "grunt." Mom always rushed over and handed her whatever she was pointing at. The kid learned that she really don't have to "work" or "ask" for anything, just a point and grunt and it's hers! So, if she's trying to show you something or wants something, wait for her to actually ask (or at least try to ask) for it.
I was also one of those "weird moms" in the store who pointed out and described everything! When dd and I would go to the grocery store, clothes shopping, whatever, I just talked to her constantly. It would be something like: "Okay, now we're here at the store, and we need to pick up some bread and milk. Don't let me forget, okay. Ooh, look at those bananas, should we get some of them, too? These are really yellow and big, how many do we need? Maybe 4 or 5? What other fruit should we get?" Pretty much a running commentary of what we're doing, what I'm looking for, etc, with some pauses where (if she had been talking) she could respond. Now, she's a very vocal and descriptive 4-year-old, who uses some fantastic and advanced words! She is in speech therapy for her articulation, though, so we are still a work-in-progress.
PS: At your next pediatrician visit (at 2y/o) they will ask how many words she uses--be honest, and tell them you're concerned about it.
Good luck mama!