Shirley has arrived, and she is, as I surmised, the young owner of Fieldhead Hall and therefore Mr. Moore's landlady. So far the narrator has shown her to the reader only from the outside, i.e. her emotions and thoughts are not revealed, and so she is just a little bit mysterious.
While Shirley owns the book's title, the protagonist so far has been Caroline Helstone and it looks like an interesting little love triangle is going on between her, Shirley and Mr. Moore, with both ladies in love with him and he wavering between the penniless Caroline, whom he seems to feel some regard for, and Shirley and her money, which he is in dire need of. I only hope it will not lead to the very tiresome trope of one of the ladies dying to make way for the other to marry the gentleman. The death would have to be that of Caroline, because there have been possible foreshadowings of that nature, although there has also been an indication that it will not happen. I hope it doesn't - it's such a cliché, although maybe it wasn't considered one back when the book was written?
This, by the way, is looking more and more like a mixture of romance and a social novel, since the problems with the cloth mill and the workers are often mentioned.