First of all, what the heck is PMDD?  It sounds like some kind of mental
illness.<G>  Now for some of your questions.

>Is Ferrous Sulphate the result of chelation?
No.  Iron(II) Sulfate (ferrous sulfate) is not chelated.  It is a simple
soluble iron salt.  In a typical aquarium environment the iron will quickly
oxidize to iron(III) and precipitate.

>This product contains Copper.
I don't see why anyone would deliberately add copper to a planted tank.

>What provides the EDTA here?
If this is the complete list of ingredients, nothing.