What best explains why women like Mary S. Paul went to Lowell, Massachusetts?

Mary S. Paul was a fifteen year old girl who wrote many letters to her father in Barnard, Vermont. These letters where written around 1845. Your question refers to the document titled: 'Relationship between crisis and the American Dream, Unit 8'. In this document the following letter reads:

"Dear Father: I received your letter on Thursday the 14th with much pleasure. Last Thursday we were paid. In all I had six dollars and sixty cents paid $4.68 for board (lodging) ... Perhaps you would like something about our regulations about going in and coming out of the mill. At half past six (the bell) rings for the girls to get up and at seven they are called to the mill. At half past 12 we have dinner, are called back again at one and stay till half past seven. I get along very well with my work. I can doff as fast as any girl in our room. If any girl wants employment I advise them to come to Lowell (Massachusetts)."

The answer that best suits your question is:

There was a high demand for cheap labor in the textile industry.