invented to keep out the cold
Ulon wanted her to be subtle. If she was meant to just change things by telling people what she saw, hiding her thoughts would make no sense. Mother even told her she was not to reveal this had happened. Counterpoint, a vision unused is wasted. Her instruction, thus, must be to act on this in a way which means her relevance in particular is unknown.
When she puts it that way, it's obviously correct; what public knowledge of Ulon exists believes the cult nearly destroyed, and remembers its times of power only as times which called for its destruction. The local Norgorberites don't much care about three-millenia-old grudges, but Norgorber himself may well. If Ulon has found a way to use prophecy, and is puttig it to use here, he wants it to stay hidden, which means not drawing too much attention to herself. A spider's-claw without meaningful connection to her or Ulon? Far more usable. Of course, pulling in an actual person to play the role would be an immediate risk, and that seems foolish as well.
The Bank of Abadar is known to hold client information safe. It is not known to hold it infinitely safe, but it at least tries not to spread things around. It also doesn't actually require a client to be present in person to open an account, though it makes clear its fabled security measures are of limited use for an account handled entirely remotely. Fortunate for her, then, that those security measures won't be what she's counting on.
The contract she writes for the Bank claims to come from a caster who likes privacy, and is willing to take some risks for it. Unfortunately, they also know of ways to track a caster by their magic, and so will be proceeding without directly casting any spells on exposed objects. It requests the creation of a new anonymous account tied to a codephrase. The codephrase is written on an attached paper in a liquid invisible on paper until heat is applied, at which point it permanently becomes visible. ("If the codephrase can be seen before you have gone through this procedure, my counterparty is not as trustworthy as expected, and the entirety of this contract is null and void.") It then requests the transfer of 200 gold sails from the account of "the undersigned" to that new account, to be bet on the conjunction of the expected Breaching results, with as much as possible of the winnings from one bet to be immediately placed on the next. The day after the Breaching, the undersigned is to be returned half the funds in the new account, whatever those might be. The remaining fraction is to be retained for use with the codephrase.