A fallen woman and Cousin Kate

Last lesson we discussed what could be the possible definitions of a 'fallen woman', and several suggestions were made in the class. One suggestion was that it could just be a woman that has tripped and fallen down. Another suggestion was that it could be describing a woman who has succumbed to some kind of pressure, for example sex or drugs. One of the most agreed upon suggestions was that it was the definition of a woman who has fallen emotionally, whereas a physical act is being used to describe her emotional downfall. Betrayal is an example of something that may cause this.
   
Last lesson we also read through a new poem, entitled, 'Cousin Kate'. To simplify the poem, it seems to be about a woman who was sought after and used by a rich and powerful lord, only to be disgarded for her Cousin, Kate.
The poem is told in the first person, and for the first two stanzas it seems to be adressed at the reader. After this though, she seems to be adressing Kate herself, for example when she says, "You grew more fair than I". And in the last stanza it appears she is talking to her son, who hadnt been mentioned at all previously. This change in adressee may indicate that she is telling a story or talking to herself.
Another interpretation of this poem is that cousin Kate may not actually be her cousin, but she is using the prefix 'cousin' to describe their similarity and their relation with each other.
This poem is linked with the aspect of the 'fallen woman' as the character reciting the poem seems to have been emotionally betrayed and has fallen herself.