Is it permissible for a Muslim woman to visit her Christian friend and pray in her house, and is it permissible for a Christian woman to visit a Muslim woman in her house?

One must be cautious about befriending a non-Muslim girl, as this could lead to being influenced by her religion and morals. It is permissible to visit her in her home or to host her in your home. It is also permissible to pray in her home if the place is clean. One should be keen to demonstrate the morals of Islam and invite her to it with kind words and beautiful actions, while avoiding any inclination of the heart towards her.