I am in Lubbock about 120 miles south of Amarillo and I am about to complete a 2 year contract with att for sat and internet. After having suddenlink for a couple years. First thing I would suggest is forget the phone on the triple play unless she just absolutely has to have a "landline".
At&t offers more channels for a similar price, although all the basic ones are still with suddenlink (the difference for me was espnu on suddenlink required a "sports package"). Just make sure all her favorites are on the packages being compared. My deal with at&t gave me unlimited data, while suddenlink was capped at 300gb.
Service, reliability was about the same on both. Amarillo gets more snow so she might be sweeping the dish off sometimes, but that package of at&t allows you to stream the bulk of the channels from directv.
Back to the phone, if she does need a "landline" she could get a home based cell phone. It is a box (you can get one at walmart) that connects to the local cell tower. You plug your phone into it after set up and it is just like having a landline but you are using the cell tower. I set one up for my mother and it is $15 + tax per month. Unlimited minutes and with nationwide toll free. The box has a backup battery, in case of blackouts. Just make sure the phone being plugged in to it also has battery back up and all should be good. The phone at suddenlink says about $15 or $16 per month but by the time you add the phone fees, etc. it is closer to $21/month.