Letter from Anna Mack to Arthur Bagnall's half-brother Thomas Higginson

I have no idea who Anna Mack the author of this letter was. Had she known the family in Ireland or England before moving to the States? Who was she and what was her relationship to the Bagnall and Higginson families? She gives her address as Box 813, Quanah, Texas, is it possible to find her on a census?
It took me a while to realise that her letter begins 'Dear Friend Tommy' not 'Dear Friend Tony', the letter was written to Thomas Higginson the half-brother of Arthur (Art) Bagnall.

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                                                                                             Jan 27--21

Dear Friend Tomy

Arthur has been here for week look good with all his hard working Well Tomy you & Emma will be out there the first money Arthur make as he is anxious to have you out here with him and you are all welcome here it nothing stylish or is it what I have been having but it spell home and we can have you good time untill something turn up Tomy money is very scarce here until bring it take all to live as it everything going out nothing coming in but all looks good & in short time I think Arthur will strike it lucky. Tomy all we can do in the mean time is wish hard - it to come you know I heard that a person wanted anything very bad and keep his mind on it would come true ...... in Arkansas that the place Arthur is stopping & has some good prospect there ...... small Oil town just starting it would ...... a good place for one of the girls to work as typist they pay good money. Tomy we expect oil in this town & may have chance to move to Arkansas or some other place that larger. Although it nice here the climate is good and I know you all will enjoy it hoping Arthur will have good luck so we can all be together soon

                                       i remain your

                                        Friend

                                        Anna