I'm probably doing no more than summing up what's already been said, but this really is
(a) quite normal; and
(b) going to have no effect whatsoever (financially) on poor Mrs Pilot.
As a number of people have already said, sons sue fathers, wives sue husbands and mothers sue sons all the time without rancour, because in fact it's the wife suing the husband's insurers, not the husband himself, and both parties end up benefiting. Often the only way to ensure that insurers pay up is to take the party they insure to court and to prove negligence.
And before you ask, no I don't agree with it. It certainly isn't personal, which is one saving grace, but I'd be the first to argue for a civil compensation culture which does not focus on apportioning blame (or at least avoids the courts). One step, I suppose, would be to regulate insurers a little more and make them pay up a little more readily, but quite how you go about doing that I leave to others.