I guess also depends what they'll be doing. She could in theory install XQuartz and run GUI apps over SSH but that might become more complicated.
If they're gonna do networking and stuff I'd maybe also get into VirtualBox just because networking in VirtualBox is easier to deal with. UTM is kind of like using libvirt on Linux, it relies on the host to do a bunch of stuff like bridges and firewalls whereas VirtualBox just handles most of it internally and has a nicer GUI for it.