Talk to your DM! Does the warlock have a copy of her pact that she (or anyone in the party) can read? This would be the perfect time to call on any Wizards or diviners you may have helped out in the past.
It may feel like you need to spring a Wish on your DM, so they can’t twist it against you, but actually, the spell, and any big moments like it, will be way more fun if you work together to figure it out. When your DM knows what you want to happen, they can find ways to work it in, and the story almost always ends up better for it. Collaborative storytelling like this is the whole reason we play TTRPGs and not only video games
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