I think it kind of does, actually. I mean, no one gets to dictate how another feels, but I personally think that if you didn't try your reasonable-to-the-situation* best to get what you want, you shouldn't be upset about not getting it. "Oh, I really wanted that job and I applied, but I didn't follow up with the questionnaire like they asked and now I'm really upset I didn't get the job." I would think about that person, "Well, what did you expect? You must not have really wanted that job if you weren't willing to send in the questionnaire. Frankly, I think it's silly and immature that you're upset. You didn't do your part but expected to get the job anyway."
*Obviously, what you think is reasonable and what I think is reasonable is different. I think 2 messages is reasonable while 1 is not. Anyone is likely to miss one message, but the likelihood of missing 2 is less. I may even send more if it is that important to me.
I don't think that's at *all* analagous!
The OP's mother is not a potential employer to be wooed. She's the OP *existing social contact*. (I won't even play the "she's her *mother*!" card, but Miss Manners sure would. In most people's worlds, mothers deserve a little bit more consideration.)
I think that the people we already know, who have reason to think they are valuable to us, have every right to be offended if our attempts at communication have been ignored.
Oh, sure, from a practical point of view, if you want something you should keep after it--but that still doesn't mean you don't have a right, Etiquette-ly speaking, to be offended and ticked off that someone has ignored your attempts at communication.
Returning someone's attempts at communication is Etiquette 101, I think (when that "someone" is someone you already know).
If the OP has clearly indicated to her mother that a certain method of communication does not work, then she is immunized. But she'd better turn off her voicemail completely then! Her answer would need to be, "I didn't even realize you'd left me a voicemail--I never check it at all."
And technology can completely fix this, as long as the OP's mom will use a new phone number:
If you use Google Voice's voicemail transcription service, Google may transcribe voicemail messages into text and email and/or SMS the resulting text to the email account or phone number(s) designated in your user settings.https://support.google.com/voice/answer/115986?hl=en