Based on these factors:
We know Faq was successfully hidden for hundreds of turns by way of Predictamancer/Foolamancer
We know Wanda eventually works for Faq
Wanda, although not a popular caster, is getting some notoriety and success in combat -- I'd think at this point, unless her enemies and allies are wiped out, someone would want to possess her other than Faq, and would mount a search if she's not found after a battle
"I'll have a lot of wuhck to do at home, now" could mean that they expect to have to work much harder to make Wanda "disappear" into the Kingdom without others hunting her down, most likely after Jillian "rescues" or otherwise captures her in battle. This could make for a rather intense plot -- having Haffaton or whatever pursuers trying to track her to Faq with some sort of "Indiana Jones" character as a Warlord, ultimately failing -- and probably disappearing into the mountains around Faq, never to be seen again.
Of course, they could just fake a body during a climatic battle and cart her off, but it would be interesting if they had to evade capture... Depends on whether they want to stretch out the plot that way, I guess. I could see it either way -- in a world of near perpetual war, even powerful units may become quickly forgotten or written off as "lost" under the right circumstances, but given the buildup of Wanda at present, I'd think someone
would be interested enough in Wanda to not casually accept her simply "vanishing".
Don't really have much basis for another speculation, but I think seeing
Wanda made Marie's predictions more solid. Predictamancy may start with vaguer visions that come into focus dramatically when certain "prods" are made to the Predictamancer's environment, such as introducing people or objects involved. Metaspeculation: would Marie have predicted which Tool Wanda would have obtained if the tools had been directly seen by Marie? If Marie had been at the negotiation of the invasion of Faq -- where Wanda "sold out" to Stanley, she might have seen the Arkenhammer and mumbled to Wanda, "No, not that one", changing the entire course of the story.