I did enjoy the story mostly, it kept my interest to the end, but there are elements that will bother the moder reader. I am not one to be easily offended when I read older literature, because I am aware of the book in its historical context, but sometimes it goes a bit far and it can make the modern reader uncomfortable.

WARNING - SPOILERS AHEAD

Here, there seems to be a lot of emphasis on the supposed lesser intellectual capacities of the main character. To me she just seems a bit naive perhaps and sheltered, which is difficult to believe as she worked for a personal shopper and assistant all over London for years.
Not only is she repeatedly described as stupid, she's also physically tall and overweight, as I presume a contrast to the dainty young ladies. And at times the focus is also put on her large soft eyes, like an animal... I mean, what is she modelled on, a friendly placid cow? There's no need to pile on every thing like this.

The second obvious element is the racism against Indians. The Indian ayah is akin to an evil witch and of course the only redeemable Indian character is only half-Indian. Brace yourself for the stereotypes and the "half-breed" comments.