AO,
Cold, stiff wet mud can be slick as glass; clay especially. It's like landing on ice or driving on a skid pan.
Slightly frozen across the surface and thick mud underneath can be particularly dangerous. If one has the time, especially if it's got a little snow on it or one isn't sure if it's properly frozen, one can put one wheel down lightly, run it along the runway, then pick up and go around. One comes back down the runway the next time to see if the rut or track one made has filled up with water or mud.
Otherwise, it's a soft-field landing, trying to keep the wheels from getting mired or keeping the aircraft from getting stuck and flipped.
The fuel gauges in the Queen Air, like most light airplanes, aren't necessarily that accurate, especially when one is dealing with just minutes of fuel remaining. One might have the amount of fuel one thinks, or one might not. If the consumption is just slightly higher than what one thinks, one may be out of fuel and not realize it. That might be an interesting side note to weave in there; she thinks she has that much fuel remaining, but really has no way to know; she can only hope the fuel holds out because in reality, by the time the fuel is this low, the gauges will be sitting for all intents and purposes on empty, or bouncing off the peg.
The only time that gauge is required by regulation to read exactly correct is when it's empty. When it gets close, it will very nearly the same as empty. Further, when the tanks are that close to empty, any diversion from straight and level flight, even a slight pitch up or down, can starve a tank of fuel and cause the engine to hesitate, skip, burp, or quit. Also something that may be useful for your protagonist. Perhaps she banks in one of the turns and the engine runs rough or quits, and she levels the wings quickly or shallows her bank to nurse the airplane around to the new heading, to keep it from dying.