There's NO info on the wiki about the Temporal Beacon mission... Would you be so kind as to share your experience and knowledge?
You can either buy a Temporal Beacon off the exchange (I believe), or randomly draw one from a Temporal Lockbox.
When you use the Temporal Beacon, you activate a DOFF mission that can award you with a Temporal DOFF. It should work pretty much like the Holonovel Code Fragments that came out of the Ferengi Lockboxes.
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There's NO info on the wiki about the Temporal Beacon mission
It's right there in the wiki-link, posted 2 posts above yours, including a full explaination on how to obtain the objects that start the doff assignment. It's also right there if you enter "Temporal Beacon" into the wikis search bar.
I'm willing to bet that it's also the first link if you google "Temporal Beacon".
If you want to obtain her, just buy her on the exchange. ~125k EC Fed-side, a bit higher for KDF, but there is usually at least one in the list of "10 cheapest, rare Doctors on the exchange".
She's pretty much what you DON'T want to get if you crit a temp beacon assignment or open a temp doff box.