That's the curse she gave to her sibling and herself:
Osiris will not have Seth
Seth will not have the love of his family
Nephtys will not die
And herself will not have Osiris
She basically circumverted her own curse because girl forgot that Osiris doesn't want any of her p***y...
Sorry, I had to censor myself because I was beginning to rant. That doesn't make any kind od sense...
Not just that she wouldn't have Osiris, but that she wouldn't get anything she wanted while bent on revenge: she told Seth that since she had cursed herself to not get what she wanted, that's why Horus had to become king in her place, because she couldn't get the throne herself due to the curse, and in chapter 57, it was her own curse on herself that prevented Isis from completing her attempt to flood Egypt (which she tried when she thought Seth had killed Horus), and in chapter 64 Thoth explained to Isis that it was also Isis' curse on herself that made it so easy for him and Maat to discover her secret Plan B with the foreign god, and for them to ruin it by intercepting this foreign god the minute he arrived, making him sign a treaty not to interfere with Egypt's business.
I still have a v basic question. What was the curse isis placed on herself— that’s the only part i don’t get