I'm sorry that has happened. I'd keep my meds under lock and key from now on. It's a shame you can't trust some people.
You need to try to ignore your sister if she tries to start something. You don't want to ruin things for your Mom and you would feel even worse. If she does start, just ignore her. Instead of hearing what she is saying, just repeat in your head, "Not a clue." See if that helps. But, I wouldn't respond to her or just say that it isn't open for discussion and walk away. You want to be the one in control...not her.
I was at a dinner party last night and a friend of mine started in about my hearing and implied that I could lose my license because of my hearing. She talked about it twice and quite loudly, too. The first time she mentioned this to me was over a month ago. She knew it upset me then. BUT, I did research and there is no way I would lose my license because of my hearing. I might have to put an extra mirror on my car. But, she knew that topic upset me the first time and she did it again...twice...last night. I let her dig a hole for herself. She will look might dumb when people realize she doesn't know what she is talking about. I just sat there, with a little upturn to my lips, and stared at her. I kept thinking..."What a fool"! It didn't bother me at all this time! So, give it a try.
Have a wonderful day with your Mom.
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Fibromyalgia, Crohn's Disease, Ostomy, Diabetes, Autoimmune Inner Ear Disease, Osteoporosis
God does not give us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7