When B was--hmmmm, hard to remember, with all the kids' surgeries, but--either 4 or 6, he had a bone graft into his upper gum, and was allowed only liquids and semi-liquids for 6 weeks. This was a kid whose main food was meat. It sounds like you and the commenters have thought of most of the things we thought of at that time.

Will she eat "smashed" potatoes--cooked in chunks, then just smashed with a fork and butter or gravy over them? Lund's/Byerly's has several kinds of frozen soups (in boxes, in the freezer case) that aren't hideously pricey--I don't know if she'll eat any of those.

Are the folks running the servant trip going to be able to accommodate her?