Her method sounds passive-aggressive to me.
Quote:
And I explained probably 2-3 times why it upsets me when she does it and told her to stop stuffing me into her hypotheticals
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If you lie to her ("I have another call") the incident will not be a learning opportunity for her. And eventually she will suspect or figure out that you are lying to her.
(I bet you're thinking "She'll never learn so why bother?"

) Here's why:
I think you have her set up very well for calmly saying something like, "Mom, you know I hate these hypothetical scenarios. I'm going to leave now, have a good day." And then definitely hang up.
If you do this, two good things happen:
1. She might eventually figure out that if she wants to talk to you she needs to stop the scenarios. But even if she never figures that out:
2. You will, with honesty, spare yourself from hearing her scenarios, and from getting upset!!