Low resolution conflation of things is a very understandable outcome. It’s a lot of vocabulary to absorb to speak precisely about UI in general. I’m glad your grandmother has someone like you in her life.
On the whole, she was actually pretty admirable in how gracefully she aged. In her 80s she decided on her own to move into an elder living community not because she actually was having any issue doing things on her own, but because she knew that it was inevitable that she would start needing help and wanted to make sure she was somewhere that was equipped to handle it when it happened. She also decided on her own to surrender her license because she didn't think she should be allowed to drive anymore and took advantage of the community's shuttle buses when she needed to go places. I think she would have been the first one to say that she did not think she should not be the one trusted to make sure that she could use her computer safely and that systems that required people like her to know what to click are unethical!