WOW! The only thing I can think of is like the old weaver's frames. Can't see where something like that could ever be portable. As far as weaving strips of fabric, the only thing I can think of doing is say get 2 finish boards and put a sleeve over each of them with an edge to pin to. Sorta like what a long armer would use to pin quilts to. She could then attach length strips with pins to secure and then weave her horizontals.
Sorry all I could think of.