Lethal mutations don't actually age up past a certain amount. You won't be able to breed her and she won't survive. Reviving her via. the canopic jellyfish or using the slot jelly means you don't have to look in your pride dynasty. It means she would be like a trophy

She will only have 2 months to live

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You dont have to freeze them if you dont want to, obviously! You can save them in your Dynasty and look at them there, but it has few downsides; they will be "dead" so you wont be able to add any new decors on them, and they'd have permanent Halo decor on them which you cannot unequip. And they wont be in your actual pride so you'd have to go to your Dynasty to see them. If you're fine with it, then nothing stops you from just saving their records in the Dynasty when they die.

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I was going to cure it because the jellyfish is so hard to get. Others also suggested freezing them for monetary purposes.

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If you cure it, then it will become a plain non-mutated lion - basically, you will destroy any value in them. Lethal mutations can go for high GB value when sold, normal lions are often not wanted even for free.

You can try selling them before freezing, people might also buy them not yet frozen.

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I have a spare canopic jelly if you need/want it to freeze her!

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