Does the repentance of one who blinded her mother by making her drink her urine, and then regretted it and repented sincerely, despite her intense feeling of guilt and suffering from pangs of conscience, and her fear for her child of contracting a disease that she previously suffered from and recovered from, get accepted?

What you did to your mother by making her drink what you mentioned is extremely reprehensible and an act of disobedience (uquq). It highlights the danger of bad company and how Satan leads to sin, then to something greater than it. You have done well by repenting to Allah and seeking forgiveness from your mother. Informing her of the reality of what you did serves no benefit and may even cause harm. We advise you to have good thoughts of Allah, to do good deeds in the future, and to be dutiful to your mother. Try to forget what happened so that Satan does not bring sadness to your soul and lead you to despair of Allah's mercy.