Burn to a crisp, chemical bath on the bones to get rid of the leftover organic matter burnt on or still stuck on the bones. Mixe ashes into ash bucket. empty into a garbage bag and throw bag into random city garbage on garbage day. Use morning Tim Hortons coffee cup to get rid of chemical stuff into random garbages containers (keep cup, fill it at night, throw out in the morning before getting a morning coffee), meanwhile, using a vice to crush bones to a powder, don't forget a face mask, that shits bad for you, then dissolve into large quantity of vinegar, flushed down the toilet. Spray down room and vice with bleach. Throw out everything, paint, floors, redo it all. Sell vice on mracing for 20$
Edit; you invited her over, she never showed. For the vehicule, drive it to random dep near your place, where she could have stopped for gum and where there are no cams. She stopped for gum and never got to your place.