What is remarkable about Mr. Jagger’s housekeeper, Molly?

I think Jaggers makes an effort to point out (when
introducing Molly in a rather strange way) that Molly's wrists show formidable strength.
I think this is to be a reflection of her character. It may not matter what her strength
lies in, nonetheless, it is a strength.

What I find
remarkable is that her daugther we later find is also a woman of great strength. The
difference may be what each of them chooses to use their strength
for.

It seems that Jaggers made an effort to point out this
strength to Pip for a reason. It is as if he was giving him a
clue.