He is thakur, she his servant.
I could be wrong here but I do think Loha feels a bit for Lalli (or as much as possible given the type of person he is), and respects her strength and will. I think he is secretly pleased at Shekhar's transformation into a stronger son, and Lalli's role in making this happen. I also think he has noticed her sacrifices for Shekhar.
Or do you think he could care less about Lalli? He wants a waaris, so he should be somewhat pleased, no?