This is always the first addon/extension I add to a browse; installing uBlock is like "sudo apt update && sudo apt update -y" on a freshly installed system -- you're asking for trouble if you don't secure things as soon as possible.
Changing the icon to, shudder, the edge icon might help and call it "Internet" and maybe she will use it. Most people do not really know, or care, that their browser is.
I do this with very un - techsavvy people and install uBo and they have a fairly safe time online.
I have had a few cases where even that didn't work and instead I had to switch to my phone and disconnect from my wifi to ensure that the DNS block list I use isn't the problem.