1- The hadith you mentioned basically indicates that a woman who is completely independent and makes her life decisions can get married without anyone’s permission.
2- The source given to you is correct. It’s the Maktaba Islamiyya version.
http://shiaonlinelibrary.com/الكتب/1231_وسائل-الشيعة-الإسلامية-الحر-العاملي-ج-١٥/الصفحة_3#top
3- We have hadiths that non-Muslims cannot be guardians of Muslims, and many scholars have said the end of 4:141 also proves that Allah has not given Kafirs any authority or guardianship over Muslims.