I use Ableton's Looper effect quite a lot. It's very easy to use, there's nothing much to explain really. If you can work a loop pedal you can work Looper. I like it a lot and it's a great composition tool but there are a few niggles with it, the main one being that it doesn't crossfade loop ends properly so you can get clicks and pops where the loops join.
The main issue with 'going computerised' is equipment -- having a solid and reliable laptop, audio interface and foot controller. Once you start tinkering with the likes of Mobius the sky is the limit in terms of complexity but you can still keep things as simple as you like. Speaking of Mobius, if your friend just wants to loop then that can run as a standalone, it doesn't need a host. But then if she wants to experiment with various effects then Ableton is an excellent host, though others could work as well. Reaper, for one, is massively cheaper, is very stable and has extremely flexible audio routing capabilities. It isn't designed to be used live like Live is but if you just want a flexible host for plugins it could work well.
Long story short, Ableton would probably work very well for her purposes but there are alternatives. I think they still have a 1 month fully functional trial period for Live. Probably worth checking out.