Will there be enough simplicity to get her started?
1. Not unless she is WILLING to learn.
2. Not unless SHE finds it NECESSARY to use a computer.
3. Not unless you are willing to teach her.
4. Not unless you ease her anxiety and apprehension by starting her with a much simpler operating system, i. e. an Android tablet.
Let her get to become more at ease with the "intimidating" technology. Then ease her in to Windows OS.
I have a high school alumni who is a retired professor. She knows next to nothing about computer and afraid to learn. Not easy to teach someone who is USA and I'm in Canada.
A professor who knows no computer ?
Her excuse : " There were no computer classes in university back then".