Hendes would mean that she reads someone else's books b/c sine is used for her owns and hendes for other's :) hope this would be helpful
The ds in Danish are usually (with a few exceptions) silent after certain letters, including "n", but I think it takes time and a bit of patience to hear the slightly subtle "en" on it. Just keep practising and you'll get there in the end
but still i can't distinguish if its said kvinden or kvinder :/ while kvinderne i'm already able to recognise :)
In my case i notice the "kvinder" assimilating it as the word "cleaner" maybe this helps you as well!
Kvinden is pronounced quite similar to how you write it whereas Kvinder is pronounced with an 'a' at the end. So you pronounce it like 'Kvinda'. Kvinderne is pronounced like 'Kvindane'
How would you know the difference between 'she is reading' and 'she reads'
There is no difference between those sentences in Danish. Both of those are 'Hun laeser'
No, because "hendes" would be referring to another woman's book, but sine is referring to the origional woman. I hope this helps!