@spotiche5- A more invasive medical procedure is not necessarily the best type of treatment, and sometimes less invasive treatments are best. If your mother's eye pressure responds to eye drops, that is great because it means she is able to avoid a more invasive procedure like laser treatments.
The fact that your mother's doctor gave her a choice of high eye pressure treatments is also a good sign in my opinion. It think this means that her issues were caught early and are very manageable. I think it also means that her doctor is monitoring her closely, and will advise her to switch treatment routes if need be. In other words, I don't think that you have to worry, just make sure that your mother always follows up with her doctor as recommended.