No don't discuss it with them, they will absolutely side with her no matter how strong you think your relationship with them is. "Blood is thicker than water" absolutely applies. Many LBS's have thought they had helpful in-laws only to get blind-sided later. It's fine to remain friendly with them, but no R talk. If they bring it up then just say the two of you are taking some time to sort things out and leave it at that.
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Should I have said tough sh*t to the cell phone ordeal?
If you refused to help then she would probably see it as you being petty/ vindictive. Helping her doesn't really help your sitch, but not helping her may hurt your sitch. I see things like this as kind of neutral, just make sure that if/ when you help her you do it with no expectations.
