when clifford gives hepzibah the lead when they get off the train what does she do

This quote pretty much sums it up,

She knelt down upon the platform where they were standing, and lifted her clasped hands to the sky. The dull, gray weight of clouds made it invisible; but it was no hour for disbelief; -- no juncture this, to question that there was a sky above, and an Almighty Father looking down from it!

"O God!" -- ejaculated poor, gaunt Hepzibah, -- then paused a moment, to consider what her prayer should be, -- "O God, -- our Father, -- are we not thy children? Have mercy on us!"