The Vegetational Fatherhood

I find this tale very interesting, because of all the symbolism that is interwoven into it. When reading the story at face value it seems like a crackpot story about a rose that impregnates a women and they have a daughter who undergoes metamorphoses and ends up being thrown out a window on her wedding day. So, I tried to read between the lines, and examine what this story is really trying to say.
I interpret the Rose to signify the virginity and the purity of the mother. This idea is further enhanced by the sexual encounter that the women experiences, after which the rose is gone. She has undergone a change that has resulted from her sexual encounter. The story reads "she awoke as though intoxicated with the feeling of some dark knowledge in her limbs. Her mouth was burning from a strangle glow. Her lap was covered with rose petals, her clothes in disarray." After this she gets pregnant and gives birth to a daughter.
The daughter at first grows like a flower. She "blossomed more and more gloriously with each passing day." She paints the picture of the rose labeled "Father," and acknowledgment that she is coming of age and realizes the nature of human reproduction. When she reaches puberty, she undergoes a metamorphoses into a flower. This represents her ability to have children (as evident by menstruation). Now that she has come of age, she is now interested in men and wishes to get married.
The ending of the story really stumps me. Perhaps she is unfaithful, but that does not account for the fact that the mother collaborates the husbands story and they both end up in an insane asylum. It is interesting that the story says "according to Emma's exact testimony, it was beyond all doubt that Dr. Rosenberger had flung his wife over the balcony railing." This seems to suggest that the metamorphoses of the wife is in fact symbolic. The reason for throwing her out the window is beyond me.