Poetry routines breaks grammar rules. A lot of poems rely on very specific white space layouts that you'd never see in writing.

And your example shows how you can just use multiple dashes instead of having three different ones.

I have read her in the past and can't say there were world's of meaning between -'s. Can you link an example? I looked again and couldn't see any obvious ones. Generally she just completely abused the -. Does she even use a comma once? lol