Is it forbidden for a girl to help a blind or disabled young man or man cross the street or descend stairs?

It is permissible for a woman to help a man, and vice-versa, if there is no fear of temptation (fitna) and if the Sharia-compliant controls are met, such as there being no softness in speech, no forbidden touching or gazing, and no private seclusion (khalwa). If she sees him falling into perdition, she must guide him and prevent him from thedetestable act, even if that leads to touching him.