My fiancee is becoming agnostic

Assalamu alaykom, Im 20M and my fiancee is becoming agnostic because she is having doubts about islam.
She was religious months ago and even advise me to pray and fast more, but lately she’s having doubts in her faith.

She’s reading more about islam and is having difficulties accepting certains hadiths and rules like the whole ملك اليمين and slavery being « halal ».
She also tells me that islam is a men’s religion and it discriminates women on many aspects: she told me that there’s no reason for women not to have jawari in janna for example.

I tried convincing her on multiple occasions but she always get triggered easily.
What do i do is there more sound arguments about those subjects.
Please help me i really love her and want to do nikkah with her i need to convince her again.