Purdah

Assisting a non-mahram woman

Q: Is a brother (caller of Islam) obliged to continue helping a sister with disabilities if she has no one? She learns the deen through him instead of others. If the brother is choosing to not help her, will he be responsible before her in the Hereafter? He is choosing to not help her, because he cannot deal with her.

Non-mahram approaching a group of ladies

Q: If a female is among a group of other females and a non mahram male approaches the group of females to speak to the other females she is in the group with, is it enough for this particular female to lower her gaze and refrain from useless chatter with the male while still standing in the group or is she supposed to leave the gathering when the male approaches?