The only thing that comes to mind is that she is of a traditionalist mindset. A lot of older people hold a belief that Vatican II changes are not valid or upset the true order of how things are supposed to be. I'm not going to talk about those changes, but it's a very different Catholicism than she grew up with. One thing that I will say though, is that she is being unfair to say something like that to you. A true Catholic does not cast judgments on others and how they worship. Some people with this mindset forget that many people had no idea what was going on and were lost as Mass and found the religion extraordinarily confusing and lost in minutiae. Perhaps it would be a good idea to talk to her about how things used to be. I know I knew nothing about the traditional practices until I started attending a church where the Tridentine (Traditional Latin) Mass was performed. Ask her about what she believes, and LISTEN! You might prove her wrong and pick up some of her habits. About the fish: it used to be customary to not eat meat on any Friday, but Vatican II changed the fasting and abstinence rules and now the only time you must fast and abstain is in Lent.

Now, your grandmas statement seems a little unfair and a tad bit judgemental. The reason she said it was probably because some of the Catholic beliefs are hard to understand, especially at first glance, but when you look into it, you can truly see the reason why things are the way they are and it make perfect sense. It is a Doctrine (Doctrines cannot/have not/will not ever change) that a sacrafice is necessary on Fridays inside and actually outside lent as well...(i know its hard to believe and most people dont know this..but look into it, the peopl at EWTN know Doctrine and know the church..you can call them or go to their website at ewtn.com) anyway, the Doctrine for a need for sacrafice has never changed, however, the discipline as to how this sacrafice happens has. In Lent, we must give up meat-another sacrafice simply will not do. Outside of lent, you can give up meat, or you can choose to do another type of sacrafice, and that is how Catholics believe it today. I hope this helps and no one really knows if you are a true Catholic but yourself.. but you seem to have good intentions so continue to research the church.