Do I have to tell my sister everything financial?

Your question was whether you tell her. Please do not open that can of worms while mom is alive. Sis may confront her, very unpleasant, and may have an unintended result.
Once mom passes, you can choose to have a final short conversation when she reaches out to you inquiring.

I understand the vulture part. When mom dies she did leave instructions to deduct 15K from one brother's share, for money she loaned him and he did not pay back. So if sis already collected all her share, so be it.

Good grief Pam, what does jelousy have to do with it? She like a vulture circling. She had nothing to do with me for 40 years until Mom was under my care, and has done nothing for Mom but ask for money. How is that jealousy? I had to quit my life to care for Mom, and adopted sister has done nothing but spend. Even now when I tell her that my guardianship says I can't give her money, she still asks.

If mom made the decision under the influence of Alzheimer's, she was acting on anger and not what was fair. Something to consider. She could just as easily get mad at you and leave the money to her dog. Just be fair and put aside jealousy.

No you don't have to tell her, but how sad. At first you didn't even refer to that woman as your sister. Don't know know what else to say.

My adopted sister and I are 12 years apart. We were never in touch until Mom became needy. She tried to care for Mom first and it only lasted 2 weeks and they fell out. Mom has been with me since, 2 years now. My adopted sister visited twice, once a year, for a brief day or two and never offered me a break. I haven't had a day off once. I can tell she's waiting for some money, and she's constantly asking for money. Until I became Guardian this past February, she got money from mom. I told my adopted sister what the Will said, and she knows nothing is directly going to her but she thinks I'll share. When mom was still working she always had both of us as beneficiaries, but after she had a falling out with my adopted sister she remover her from the will.

This is not your news to deliver until mom passes. At that time you must tell her what she gets ( nothing). You do not have to tell her what you get. If you have affection for your adopted sister, you should be gentle, it is a slap in the face. Sad that the family is not closer, from the caregiving perspective.