Not only is Karen Greenlee one of the few documented female necrophiles, but she's also an example of what Aggrawal classifies as the "opportunistic" type. In such cases, the person doesn't generally have an interest in necrophilia. But they will take advantage when the opportunity arises, such as careers with easy access to the dead.
In Greenlee's case, she was an apprentice embalmer who wasn't caught until she stole the corpse of a 33 year old man, had sex with it and attempted suicide. Devin Faraci has an excellent summary of her confession at Birth.Death.Movies.