Annoying habit

[Asiel]

I never called my mother-in-law mom either because non of the other married in laws did. Had she asked me to I would have had no trouble doing it.

I'm used to responding if spoken to so I really don't understand someone who doesn't acknowledge something you say to them. Maybe next time you could just ask if she heard you, could she be hard of hearing and you didn't notice? If she says she heard you I guess it wouldn't hurt to ask in a joking way why she doesn't respond when you tell her something so you'll know she did hear.
Could be just a habit of hers.
Just make sure you keep her fair and not foul

[Medusa]

You'd probably become annoyed w/me, too, Ellie, b/c I don't comment either when someone says something to me unless I'm asked a question, even when speaking on the phone. As a matter of fact, when someone keeps saying "Uh huh" while I'm talking, that annoys me. The only time I would ask "Did you hear what I said?" would be if I could clearly see that the person was preoccupied and probably didn't hear me. And I never called my MILs "mom". I had one mom, she's gone and that's it. One to a customer. (for me, that is)