I think it’s possible to have her somehow take back that magic in a desperate situation, or to have her go through the trial for some reason, too (she always was kind of interested, but Geralt didn’t allow it)
I mean Geralt died in the books and is somehow alive for the games. A lot of stuff can happen and be explained in a way that fits with the lore good enough to spin a story around it
If this wasn’t enough of a wakeupcall to not put all the eggs in one basket then what is? Companies are literally doing this to lock you into their service so it’s harder to switch since you then have to find X new services instead of just one.
Better go with one that’d specialized for each service you need…