Does a girl sin for forsaking her two friends who did not visit her during her illness and when she needed them, and will she be forgiven for that or not?

Visiting the sick is a right of a Muslim upon his brother, and it is even more emphasized for those between whom there is friendship or kinship. The Sharia has prohibited a Muslim from abandoning his brother for more than three nights without a valid شرعي (religiously legitimate) reason, such as fear of harm to one's religion or worldly affairs. The forbidden abandonment is for worldly matters and personal whims, not for religious reasons. The estrangement of two female friends for an un-شرعي reason is impermissible and prevents forgiveness on the days when the gates of Paradise are opened. Therefore, one must strive to maintain ties with friends and abandon disputes and abandonment.