Your mothers existing iPhone 16e case should fit the new iPhone 17e perfectly and I had read similar also about 16e and issues with C1 modem on the Apple discuss forums.
FYI – Apple C1 modem is Apples first attempt at their own In-House modem as they was using Qualcomm previously and its not going to well. 
At least the new 17e will be using the C1X modems (Apple) so will be interesting if the bugs have been fixed.
Note: my iPhone 16 pro uses the Qualcomm modem and works flawlessly.
let us know how it goes 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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