I have an offsite graphic designer that is having issues getting much work done because her 3Mbps Internet connection is too slow to work with large files. If this was Windows, I'd just create a VM and let her use RDC to connect to it. What do I do with Mac? Past experience with VNC and the like haven't went well because complex graphics don't render well without a faster connection.
Have you tried creating a VM running OSX and letting her access the console? Easy with ESXi, just give her a URL.
And why can't she remote into a Windows VM/machine from a Mac?
There are really tons of way to help here, so I'm honestly not sure if this question should be closed as being "Too Broad", but: