[Hope]

In an all-women congregation, a woman will be the imam. Otherwise no, a woman cannot be the imam at a congregational prayer. 

Women are permitted to go to mosques for prayers but must be visually separated from the men. However, in some places where the mosque is not big enough, they will give priority to the men because men are obliged to go to the mosques. For women, it is optional.

If Women have to go five times,

They have to wash,dress, beautify five times

They have to face vulgar men five times 

Can women walk in the dark hours three times without a companion?

Vulgar/Evil people can harm women if they know the time and path they walk frequently 

If a woman is missing for prayers, other people can assume/ gossip about her ( menses and etc)