My mom is sick and I am out of energy.....Am I justified in this, or am I just plain horrible?

My mom and my little brother and sister have been estranged for 15 years. She has lived in absolute, unbearable pain about this. Some people from church decided to go check on her because she hadn't been to church lately, and that is very unlike her. When they showed up she started crying about my brother and sister and suddenly had a stroke. It's too deep to operate on and if it happens again, there's nothing anyone can do to stop it. She keeps crying for my bro and sis, and it's to the point that I can't bear to face her. All she wants is to see them one last time before she dies, but they won't. She is in a lot of pain and suffering. She's completely paralized on her left side. She's being fed thru a tube in her nose. I'm just wanting her to be at peace. But I don't want the last 15 years of emotional pain to be in vain. I know that if she pes, she'l be at peace, but my bro and sis will have to live with this forever. Is it horrible that I just want my mom to p on?