I'm looking for any more information anyone has. Below, I've posted what I've found so far:

On Absolute Write, I can only find this old locked thread about multiple agencies, which mentions Diana Finch Literary in passing, but in a positive way and nothing else.

I also know:

P&E has a "$".

There is no Publisher's Marketplace page.

An interview with the agency owner..

A bio from a writing seminar, which says she branched off from the Ellen Levine Literary Agency in 2003 and has Robert Marion as a client (scroll down about halfway).

A thank-you from a client.

Info on the agent's turn-around times for queries and more.

And, of course, I've looked at the QueryTracker.net page and a bunch of other standard stuff.

Also, lots of stuff with very little information:

-stuff about a conference she attended

-a blog post about a writer querying Diana Finch

-another blog post and a further update on same

-another blog post

-another blog post