I had APS called on me twice when I took care of my mother 24/7. Neither ended becoming anything at all. I was never given any parting insteuctions either. They are normally good at figuring things out even though it is a hassle. However, since a child is involved, the case worker overreacted and did not do her homework before meeting you for the first time. If this lady’s apparent inexperience makes your problems worse, ask for another case worker. This may turn out to be worthwhile. But then it may not.
Whatever you do, go out of your way to be cooperative and helpful to the case worker. If she gives you instructions, which you can actually take as suggestions, thank her and tell her she is being helpful. This will help to more quickly conclude this matter in your favor.
I do not believe you have any worries. So try to relax. At worst the social worker will continue to be a PITA for the time being. It would help to contact your doctor to tell him what has happened, and give him the heads up for a call from CPS. BTW your mother is a real treat, isn’t she? I will be very polite here and call her “unhelpful”.