She was not troubled about Mrs.Medlock.

Mrs.Medlock seemed always to be in her comfortable housekeeper's sitting-room downstairs.
In this queer place one scarcely ever saw any one at all.

In fact, there was no one to see but the servants, and when their master was away they lived a luxurious life below stairs, where there was a huge kitchen hung about with shining brass and pewter, and a large servants' hall where there were four or five abundant meals eaten every day, and where a great deal of lively romping went on when Mrs.Medlock was out of the way.
Mary's meals were served regularly, and Martha waited on her, but no one troubled themselves about her in the least.

Mrs.Medlock came and looked at her every day or two, but no one inquired what she did or told her what to do.

She supposed that perhaps this was the English way of treating children.