Unfortunately, we’re not the distro for everybody.
You say you want a live .iso so she can TRY plasma, BUT, you also said it’s the only thing she’s going to run because you’re the system maintainer. . .
What’s to try then? Just install EOS to her system the way you want to maintain it then??
It really sounds to me like you just want to complain and cry for something that isn’t going to happen. You’ve been told you can create your own iso…
If it’s just a trial for mom, give her a live KaosOS media and let her try it out and then just install EOS after.
Or keep posting asking for a specific solution you can’t have instead of using one several already made available to you.