Everything makes sense now

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.

Thank you both for the detailed explanation! that clears everything up; just one question

"because she couldn't get the throne herself due to the curse"
but isnt she the ruler of egypt rn though?

Only through Horus (she Tella Seth about this in chapter 39), he delegated it on her after he won black the throne (which he did after he won the 3 matches against Seth).

Ignore the typos, darn auto correct

You're right, I forgot about that. Basically their wishes can't be true because of the curse.

I remerbered only the parts where she was reciting what each sibling and herself desired the most at the moment she was casting the curse.

I'm banking on that that the green glob doesn't get Seth, but very sad Seth can't be with the love of his fam. But Horus is enough for him, in manifesting it (づ￣ ³￣)づ