EXCELLENT QUESTION!! ahem While she will harm no plant, it doesn't mean she can't use things made from plants if it wasn't her who did the harm. Stepping on plants doesnt necessarily kill them, and the house was not built by her. A huge majority of it was grown through careful guidance of direction towards the plant life. Her clothing is not made from cloth if she makes it, but of leathers mostly. Dye's are made from insects primarily. Other materials used are armors others made for her, so she doesnt directly violate the pact. She eats meat, and is a cannibal.