Sri Aurobindo
Letters of Sri Aurobindo
The best way to help A is to assist her by your own example and atmosphere to get the right attitude. Instead of the sense that she is very ill, she should be encouraged to have a bright and confident feeling, open to receive strength and help from us, contributing by her own faith to a speedy recovery. These ideas that they do not see the Mother, are outside the atmosphere, at a distance, are 
just of the wrong nature and most likely to come in the way and block up your sister’s receptivity, it is surprising that you should accept or echo them and not react against them at once. They are here in the Ashram ( a little nearer or farther makes no difference), in the Mother’s presence and atmosphere, meeting her every day at the Pranam where everyone who is open can receive as much of her touch and her help as they can hold, that is what they should feel and make the most of their opportunity and not waste it by a negative attitude.
For yourself what you must have with other sadhaks (including your sisters) is a harmonious relation free from any mere vital attachment (indifference is not asked from you ) and free from any indulgence in wrong vital movements of the opposite kind (such as dislike, jealousy or ill will). It is through the psychic consciousness that you have found it possible to be in a true constant relation with the Mother and your aim is to make that the basis of all your life, action and feelings, all in you, all that you feel, say and do should be consistent with that basis. If all proceeds from that psychic union of your consciousness with the Mother, dedicating everything to her, then you will develop the right relations with others.
P.S. It would not be right to put any pressure on your sister at Patna. The Calvé House is quite unsafe and it is for that reason that we have had to vacate it.