I think you should be pleased that she wanted someone else to "back her up and support her," since that sounds like a pansy job you shouldn't want anyway. My guess would be that your mom knows that you are, in fact, a more prominent caretaker than she has been, so she won't be able to get any sort of ego-stroking from you in front of the social worker, and might even look like a derelict daughter who is passing off so much work to the devoted granddaughter. Laura's ignorance might be the most important feature for your mom in this case, no?
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